I feel so proud of postmarketOS! I've been using them for 2nd life uses for phones, tablets, and chromebooks with very minimal problems. It's like having an obscure band you follow all of a sudden getting mentioned everywhere and I couldn't be happier for the project (like the 3rd time on Lemmy this week alone I've seen them mentioned).
If you have some scrap equipment throw it on and report your findings! There's a lot of testing that needs done and information needs to flow. I've done a "recipe" notebook with an old chromebook, a tablet for easy video viewing I can send videos to (instead of making my partner come to the comp), and like 3 other devices that I haven't finished with but pmOS will be a part of it.
Join their testing team if you have devices that aren't listed! Unlike most requirements, if it's not listed that just means it probably hasn't been tested...not that it doesn't work on your device. (they could probably also use some editors for their text instructions, it's quite back and forth with links trying to find proper instructions).
Woah cool, this is the first time I've actually read about postmarketOS, other than seeing it mentioned occasionally, and it's pretty neat to see it coming along!
I was skeptical of them at first when looking for 2nd-life OS's. There were a lot of sketchy looking and not really "user-friendly" sites/forums (postmarketOS being one of them) that I avoided but decided to try it anyways. It's been fun and I've enjoyed having a decent OS to tinker with and see what capabilities I can get out of defunct equipment.
If I could get a secure smartphone use out of them I'm gonna be ecstatic. Been staring at phones and GrapheneOS for the past two years but glad I didn't jump onto something yet.