Earlier quoted context omitted.
No. Microsoft is much better at handling an ecosystem than Amazon. As far as I can tell, MS is using standard Android with Google Play Services(?) Amazon was trying to create its own ecosystem.
Amazon has a nice suite of services. A phone that has Music, Books, Shopping, Cloud Storage for Photos, and a few key apps (Uber, Lyft, popular games) but somewhat constrained otherwise, would be great for Seniors or people who don't need a high-performance general-purpose computer in their pocket.
How do seniors learn to use devices?
Mostly from peers or mostly from children? If from peers, how do they seed the ability?
I can't see how you could get seniors to start to use a "dumbphone" specific to them, unless the UI was spectacularly easy to use.