[dredmorbius]

FWIW, I also hear good things about Kobo, though I don't have direct experience.

Those are based on Alpine Linux rather than Android, AFAIU, and if you're into Linux are apparently more readily customised and hacked.

(The fact that BOOX is Android is a misfeature for me, though it does make many more apps available. As noted, I use few of those and could replace much of their functionality with shell or Linux-native GUI tools. I suspect battery management would suffer however.)