[WhyNotHugo]

AOSP is terrible and doomed.

It's terrible in that it's huge piles of inefficient software that can barely run on hardware that's actually pretty powerful.

It's doomed in that as time passes, different FLOSS bits of it get "deprecated" and replaced with something proprietary. Or a new API appears, but Google phones actually ship a slightly better proprietary one.

There's a big conflict of interest when an ad company wanting to spy on people and lock them in is the steward of an open source OS.

EDIT: Also, don't forget that most devices out there use a custom kernel. There's no single "AOSP".

[GekkePrutser]

LineageOS still has amazing battery life though even with MicroG. 2 weeks standby on my ancient Sony XA2.

It may be less battery efficient than Google's builds but skipping all the spyware really saves a ton of battery.