Battery life status: now, and future prospects?

[displacefish]

Well look, the Nokia brick phones (or any of their semi-smart phones) will always take any modern day smartphone with regarding to how long you can hold a charge on the battery, mainly because the smaller lower spec screens,  the relatively lower spec hardware, lack of additional sensors, GPS modules etc.. in them make them some serious energy savers. I still remember the days where my Nokia brick phone (BW screen, no WLAN, no GPS etc..) would get a full charge on Sunday, and then would survive until Saturday without much effort  on the other hand there wasn't much do with on that phone so It was used primarily for making  (short) calls and a sending a few maybe 3-5 short SMS texts per week.
[...]
I would also ask, what Nokia phone do you exactly have? and what is your average usage profile ? and how many hours of usage are you getting from a single charge? that would be useful to try evaluate your question and give you more precise feedback.

Oh yes, of course, I'm not expecting feature phone levels of battery. I'm very aware that any kind of extra functionality will necessarily come with a downgrade in battery life.
I haven't really measured the battery life on my nokia, but it's on the order of 1-2 weeks. But since this is obviously not a useful comparison, instead let me mention a 2014 Moto G which I primarily use for TOTP and some occasional browsing; LTE is turned off. On that, I get about ~3-4 days idle (and my usage profile can be summarised as "idle"). Essentially, this would be a benchmark which I'd love to be "feasible" in the future, hence my question on future development: if I just forget my phone on my desk and don't touch it, can I come back two days later and have it be not dead?

Of course right now the pinephone is obviously not nearly there yet (and so my question there is more, does anyone know if it will ever be there?). For current use, I'd be content with just having it idle for a day, without having to think about plugging it in every single evening.

Maybe my usecase is a bit unusual, because, especially with the pandemic resulting in remote work etc., I barely need to carry around and use my phone(s) much: this is nice for battery life, but in turn, since I'm not constantly using my phone, it's less of a routine to plug it in all the time. (In contrast, when I was using my smartphone every day while commuting etc., I'd never forget to plug it in in the evening.) Which is why I'm so concerned with the idle battery life, more than anything else: I'm not worried about, say, the battery running out while I'm on the go (in that case, a spare battery is indeed the (excellent) solution); I'm worried about, if I leave my phone on my desk, how often will I have to pick it up just to plug it in, without using it for anything else.

A 24 hour idle charge would be enough to satisfy me, which sounds like it is realistic nowadays? I would still be curious about the prospects for future improvements though, but I suppose I'll have to go ask the devs who are involved with that directly.