I suspect there is money to be made selling a "just a phone". That pretends to do only your list above and heavily optimised the the usability an reliability o

I suspect there is money to be made selling a "just a phone". That pretends to do only your list above and heavily optimised the the usability an reliability of that subset. Any user-visible changes to those apps would be done only very conservatively. It would be a lie though. Since it really would be a Turing complete phone, with lots of programs on it. That was true even of the old Symbian phones, and items from 3-6 go well beyond what they did. Nonetheless, I think there is benefit to be gained by trading flexibility for reliability. One business difficulty/opportunity is how do you pick out services like Uber, AirBVnB etc. I suspect the solution is profitable, but user hostile: lock them into a vendor when they buy their phone.