Lets create the PineCom
Yikes! I wonder how they determine that. Standing atop a mountain on a clear day, you'd have a hard time talking to someone fifty miles line of sight with that thing. So that leaves tropospheric ducting or repeater use. And both of those options are a real stretch! Where I am you might get one mile out of it.

Packet voice over FHSS is pretty darned secure. Not hiding-from-the-government secure, but no way in heck is your wife going to find out what you told your buddy you're buying her for Christmas on it. And you could probably discuss illegal things without anybody being the wiser, assuming you didn't give the information away otherwise. My memory could be off on this point, but the way I remember it, even if someone happens to have another Direct Talk "phone", they can't listen in unless you include them in your group.

I wonder what the trademark status, and legal status actually is. I know that you can legally use it on existing radios (in the USA, no idea about elsewhere). But I wonder if it would be legal and otherwise free to make new ones. If so, that would actually be a pretty cool thing to have in something like the PineCom.
I changed my mind about small screens - consider something larger like 7-8 inches and select a 4:3 aspect ratio display to avoid window issues. Additional benefit would be room for a larger battery. Position it as a device in between the pinephone and pinetab.
I suppose it's probably a bit late for my ideas to affect much, but I still think there are important things to keep in mind if you want this to see widespread use.
I think people generally seem to have notions of this, but the PineCom doesn't sound like a device you want for day to day use. If you're depending on a PineCom, or any LoRA mesh net, things have either already gotten really, really, REALLY bad...or you work in a State Park or something.
There's this project, CellSol, that's about replacing cell towers with a zillion solar powered LoRA Pylons. Which is again, all about preparing for cell phones ceasing to be an option for you and others. But If pine64's only concern is moving units, I suggest also selling complete CellSol Pylons with solar panels in a waterproof case that can easily be put on a stick. Or anything like that that's got more development/potential. Although realistically, I can't expect some corporation to not simply make a zillion pylons themselves but with embedded tracking software if and when that ever gets popular.
Trouble is, I'm not aware of any Linux software that can to send images, text, or an audio stream to specific persons connected to a LoRA mesh net. (I found Meshenger by guessing that the name might be used in that kinda context, but that's an android app for wifi meshes.)
Availability of infrastructure and protocol is a prerequisite for people starting to strategize around a PineCom, which is a prerequisite for bulk sales.
With that kinda use case in mind...
No you don't need a front camera. You do need a back camera so you can ask someone if this thing you're looking at is edible or if it'll explode. You'll also need it to take photos of documents and scan QR codes on the screens of other people's devices/phones. And having a spare flashlight is helpful. But maybe you should put a front camera on anyway so you look like you're trying to reach students in developing nations instead of [insert people you're supposed to oppose here].
A PineCom doesn't need a proximity or ambient light sensor. An accelerometer/gyroscope can be used for inertial navigation during occasional lapses in GPS connectivity but isn't strictly necessary especially if no software uses it. A magnetometer is important out in the field and yes, it needs GPS.
With regards to wifi I gotta tell you man, the wifi reception on my pinephone is pretty terrible. I can't move farther than 20 feet from my router if I want acceptable connection speeds. Considering that this is supposed to be a post-internet meshnet device, if you can think of a means of extending that, do it! But try for rearranging the antennae first.
When it comes to SPI flash, you'll want you and your buddies to all be on the same operating system in case someone gets confused, and I think the ability of the device to write OS images onto SD cards (or it's own EMMC) by itself is important for this.
The edge of the case should protrude in front of the screen very slightly (like 1/2 of a mm) to improve drop resistance, and there should be enough bezel on the edges for a waterproof case to go over the PineCom without obscuring the screen. I'd like the device to be waterproof by itself, but I don't think you'll be able to do that and meet your $100 price point.
The headphone jack is more important than the speaker.
Making the device somewhat thicker, with a bigger battery, makes sense for this kinda thing. This will let you put the camera module on top of the PCB and cut down on overall length.
Whatever you do to the screen size, ensure that the device is short enough for shorter people to place in their pants pockets and run without causing excessive strain on the device. If the top of the device presses into your hip when you crouch, crawl, or go up a ladder, it's too tall. Keeping the same width but using a 16X9 panel should work.
And if you're still open to suggestions, I'd like a killswitch that shuts down all RF except GPS. On the outside of the device. Just that one though.
I still have serious questions about the overall purpose of this device.

Is it a testbed for post-Internet decentralized wide-area networking? That's what it sounds like. If that's the case, then we're really bikeshedding this by worrying about irrelevant details like how large the screen should be and whether or not it needs a front-facing camera. If we're going to make any progress on the extremely involved technical problem of self-configuring mobile mesh networking - a problem that no one has yet solved to the degree needed to make it scale to continent-spanning or even city-spanning networks - then we need to focus on that and let go of the rest. If this is what the PineCom is for, and it needs to be low-cost, then it shouldn't bother having any cameras, extra fiddly bits, and maybe not even Wi-Fi; all of the extra BOM budget should go into putting a decent software-defined radio transceiver in it, ideally backed by an FPGA for DSP tasks. Yes, that's expensive territory, but that's the territory we're in if we're trying to push the limits of mobile wireless networking. My first choice of hardware for this sort of project would be the Fairwaves XTRX, though since that costs about an order of magnitude more on its own than the target retail price for the entire PineCom, we'll obviously have to start smaller. The AT86RF215 chip, or whatever similar part happens to be available, might be a good start.

LoRaWAN is not going to be an effective solution, because it's designed for polling sensor networks over relatively small areas (a few kilometers, not tens or hundreds) and generally relies on internet-connected gateways as well. Additionally, LoRa is proprietary and its chips are expensive, which adds pointless complications to this already-very-complicated project. LoRa's link budgets are impressive, but an FPGA-backed SDR could relatively easily outmatch those numbers with the right spread-spectrum techniques, and with the specifics of those techniques published openly, it will actually be possible for other types of devices to interoperate with this one, which will be crucial.

Regulatory issues are going to be another challenge that I'm not really an expert on. I don't expect this will be able to get certified as an FCC-compliant consumer wireless handset, but it might not need to be if it, like other SDRs, gets sold as test equipment (which it will be).
Any reason why this would have LoRa and LoRaWAN technology instead of DASH7 or IEEE 802.11ah?
LoRa uses a proprietary spread spectrum modulation, while DASH7 and IEEE 802.11ah are open.

Maybe I am not understanding these technologies fully, but if possible it would be nice to use non-proprietary tech.
I like the idea of a low-power, low-speed network for communicating over a good distance, but I am not fussy about what protocol is used. Obviously lower cost and greater ability to communicate over long distances, with the ability to jack into wifi and run many common linux or android apps would be cool - and I am a big proponent of alternative networking methods on general principle and maybe as something to take hiking, camping, etc - good closeup speeds would be important but it wouldn't take much to communicate, say, GPS coordinates, text or light pictures, or similar. This is a long thread and there are obviously a lot of ideas here. I am definitely interested.

I also really like the idea of making the device decent as a music player, that way I could use this for music in the car and take it out to communicate, and it doesn't seem like it would be super expensive to ensure that the audio was decent and not too hard to support. It also wouldn't require notably more CPU or battery use.
it doesn't get happy
it doesn't get sad
it just runs programs
I don't know much about LoRa and alternative ways of communication so take my opinion with a grain of salt. To be honest even if a device like that cost less than $99 I would rather get the PinePhone (if I didn't have one already) since the form factor would be basically the same. What would make the PineCom an extremely interesting device for me would be some very distinct physical features related to communication like a build in physical keyboard for easier typing (BlackBerry style). Out of cameras I would keep only the front one because of videochat.
It still just seems to me that a ruggedised sleeve for the PinePhone with LoRa, Freenet, MURS, whatever capability, plus a larger battery, is the way to go.

Or heck, a PinePhone with licensed radio service capability* would probably sell like hotcakes, even for Librem5 prices. But that's a very sticky wicket.

*6m, 4m, 2m, 1.25m, 70cm, 33cm, 23cm. GMRS would be nice too but I don't think it's feasible to add that along with the others, without treading into Baofeng (quasi-legal) status.
I agree a PineCom back / case for PinePhone would be ideal.  Thinking about applications locha mesh seems a good use of LoRa - Chat and send Bitcoin without internet   https://locha.io 
perhaps the pine64 community could add Litecoin on Pine Forest(LoRa mesh)
Given the disagreement about exactly what the device should/could be, I think it could be cool to have some space inside for a removable card (maybe a small M.2 for compatibility with the PineTab SDR). Also this would allow other people to easily develop/test their own hardware projects.

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