Is there a single Linux phone/tablet that can last an 8 hour day of actual use? Librem/Pinephone/Juno can't. My uConsole can't. Different category, but my MNT mini laptop lasts like 4 hours and can't be left in standby for too long or it drains to zero.
Meanwhile, it's been 10+ years since I've worried about daily battery life on mainstream mobile devices, even my 3-5 year old ones. I can fall asleep with Youtube playing and it's still playing when I wake up. I'm certainly not here to dunk on Linux phones. I want one! But if someone willing to put forth above average effort to use these devices can't realistically daily drive them, who can?
It's a model that worked fine in multi-user setups where you ran a single executable, so that the security per user was meaningful, but today it just sucks.
Android is quite elegant in reusing the Linux kernel's permission system, but on a granularity that actually makes sense (apps are started as separate users, and they just elevated their concept of user a level higher).