Dumb mobile phones still have SMS, so 2FA still works and since it is a telephone, talking to friends and family is also possible. I suspect the reasons the OP gave up on the smart phone was to get away from all of those phone apps.

For wire transfer there are still alternatives although becoming more and more difficult unfortunately. Other things one can still do without a smartphone, and the benefits outweigh the cons (for me at least).

I don't have the full overview, but there are new "dumb" phones made that has 4G/5G, no? (Nokia 8210 seem to be one example, Punkt MP02 another)

But is Edge still available then?

Source for the 2G closure? 3G is getting silent in many areas but I've understood 2G usually stays to provide calls & sms in low coverage areas.