> The reason why no one runs AOSP is because the phone market rewards differentiation.

No, the reason is that AOSP doesn't even include a functional keyboard nor a functional call manager nowadays.

AOSP apps were abandonned around Android 11, you can't just keep them as is for real users, it looks amateur.

Even the open-source ROMs came to the same conclusion eventually and developed their own.

>the reason is that AOSP doesn't even include a functional keyboard nor a functional call manager nowadays

No one was using those apps so it didn't make sense to spend time on them.

They were used quite a lot at the time, outside of the usual Samsung/HTC, a lot of OEM didn't bother to make their own full app suite, nowadays it's necessary though

So.. The market didn't actually support differentiation?

The marked used all the different apps available from both OEMs and on Play Store.

Don't be a prick.