Things have improved a lot. It's night and day compared to 2 years ago. I have not tried Mobian, but otherwise I found postmarketOS has been the most robust, reliable, and unsurprising compared to Manjaro and Arch.
I say it's at the point where it's worth a reassessment - if you're the kind of person who gets nostalgic about the first years of Gentoo, as desktop. It can be worth it to try Plasma, Phosh and SXMO (Wayland unless you already have an opinion).
While it lasts multiple days in idle now, I'd get at least one spare battery for longer outings.
I say it's at the point where it's worth a reassessment - if you're the kind of person who gets nostalgic about the first years of Gentoo, as desktop. It can be worth it to try Plasma, Phosh and SXMO (Wayland unless you already have an opinion).
While it lasts multiple days in idle now, I'd get at least one spare battery for longer outings.