I think smartphone use has split into two paths: utility and "discovery." Utilities are the tools we use every day, the tools we want to be stable, fast, and (relatively) unchanging. E.g. sms, maps, browser, phone, camera, email. "Discovery" is all the new, unstable, changing stuff. I think there's an enormous market for a utility smartphone...and it doesn't even have to be a smartphone. Something between an old Noki…
I used to be obsessed with a "dumb phone" that didn't quite have the utility features you described years ago. I think it was called John's Phone? Loved the idea, but hated the thought of owning two different phones.
Alter Ego's concept is one I've run across:
https://goodereader.com/blog/e-paper/a-new-e-ink-phone-has-j...