> I wonder if there isn't a market for budget Androids in this range.

I think there is: https://smallandroidphone.com/ This was started up by the people behind Pebble (including its re-launch this year). I actually emailed them a while back asking for a status update. They told me there are literally no high quality screens of an appropriate size available to OEMs. They would have to design & spin up their own display hardware, which is where things change from "expensive" to "infeasible." If there was an existing, high quality 4.5~5" screen, I think it'd be an easy slam dunk. But there apparently is not...

Too bad. I just hold out hope Apple will try the Mini again before my 13 dies.