matchboxbananasynergy on Nostr: At that point, what would the "dumbphone" be used for? If you use it to communicate ...

At that point, what would the "dumbphone" be used for? If you use it to communicate with people via carrier-based calls, that's a pretty significant downgrade vs using something like Signal on a modern smartphone, where you can utilize end-to-end encryption. Beyond that, those devices are pretty godawful when it comes to hardware and software security.