From F-Droid to emulators, here's who's hit hardest by Android's new verification rules
(www.androidauthority.com)
Mainstream phone as in "I don't need to debug it via terminal"
The issue I'm pointing at: safe, long battery life, snappy maps while driving is what took AOSP more than 5 years.
It would be very unfortunate to discard all that work and start from scratch.