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From F-Droid to emulators, here's who's hit hardest by Android's new verification rules
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
When I hear 'mainstream phone', in my mind I picture an iPhone or a Samsung. So yeah, Linux phones are definitely not achieving that this decade. Though personally I don't think they necessarily need to, at all.
Point 4 is probably not happening any time soon, if ever, either. Rest is slowly being done and progressing, so I'm not seeing any major problems there.
I don't think anyone realistically expects a Linux phone to compete with an iPhone in terms of ease of use, quality of life features or UI/UX. As far as I've seen, people just want a decent phone with basic functionalities like long battery life, good camera, easy to use and smooth UI, maps and navigation. All while being more private and secure, of course.
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.