I'm currently using a Mi Band 6 (with a nylon strap that's real comfy), but I wish the Pebble still existed. The e-paper display, the nice UI and tactile buttons, with good battery life and the ability to make apps was great.

Once my Mi Band breaks, I'm torn between Garmin (since they check almost all of the Pebble boxes, even if I don't do fitness and they're more fitness oriented) and a Galaxy Watch with the rotating bezel, since that was really cool to play with, plus the Android integration might be nicer.

I wonder if the ability to easily unscrew a backplate with regular screws (like PH00) and replace the battery underneath would still be enough for the regulation.

That depends, if you buy a flagship device then in 5 years it will probably still be quite usable, but the battery could already be shot.

My phone (not even a flagship model) is coming up on 4 years old and it's still pretty fast and on the newest Android version (yay custom ROMs), but the battery now struggles to get me through a regular day, so it will probably need to be replaced soon.

That's true, but aren't federated pages at a disadvantage since you can look at them from any instance thus decreasing the number of links to one specific post (which is how PageRank works)? Since then instead of one post on page 1 you'd have 10 from different instances on page 3. I'm thinking this could be fixed if all posts had a link to the post on the original instance, which is where the ranking scores would then be more likely to aggregate.

I'm running Evolution X on my Xiaomi Mi 9T Pro and have been for the past 3 years or so. The main maintainer uses this phone so it has always been pretty polished and feature rich.