I'd add to 3 , that most mobile distros have a list of supported devices - postmarketOS Wiki for example.
And about battery optimizations ( 5 ) - Android devices have quite a number of tricks for battery optimizations, such as few levels of sleep - depending on how long the phone wasn't touched - with deepest one being very low power consumption mode with only very basic functions active and occasional data refresh for push notifications of high importance. Mobile Linux isn't yet at that level of optimization, but it will get there eventually.
🤓 Akshually, depends on the place.
In a country, where "good ol' times" can't really be characterized as times of liberal democracy - conservatives usually won't be liberals.