The Multi-Distro is pretty cool, but it is customized, it has a custom boot-loader.
It is supposed to give you an idea what the distro's look like, but they are derived from older releases.
NOT sure where you got your data on > "Bunch of people having a corrupted f2fs filesystem" ..?
I have not seen that mentioned on this forum, ... ever...!
I think, Mobian is still the only Pinephone operating system using the f2fs filesystem...
( I have been following Mobian since it was just called Debian.)
** When I searched your above quote in the forum, the one and only return was "Your Post"....
While I do agree that the ability to use an sd card to boot/ load/ troubleshoot the Pinephone is really handy.
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3x5co
To the original Poster of this thread :
I would suggest trying some other distro's from an sd card, as it is a simple way to see if the phone performs properly on a different operating system.
* And can help discover if the problem is hardware or software related.