[jokoon]

Oh ok, that's more clear.

So it happens at a higher level, in application management etc...

And then, why aren't those pinephone OS doing it better?

[throwaway0129u]

Because nobody invested half a billion dollars in development.

[megous]

Some are doing it better, some are doing it worse. There are Pinephone supporting distributions that use suspend to RAM aggressively, using autosleep and wakelocks, and all this Linux stuff Android uses too. You're just assuming somthing that's not true in your question.