Earlier quoted context omitted.
It’s also impractical for digital nomads like myself who don’t use phone numbers at all. I haven’t used Signal, but what do I do if every X months I have a new phone number? Will it still work if I swap SIM cards?
Not having a stable phone number seems impractical in general. (e.g. You can’t set up 2FA for Apple or Google accounts without a phone number.) More practical is porting a regular number to a SIP service so that you can receive important things via app. (2FA short codes typically don’t work with numbers that are assigned to SIP providers, but work fine you you port over a number from a regular carrier.)
It’s not practical to pay for a static phone number and SIP service. Phone numbers are stupid. They’re insecure, expensive, and region locked (no such thing as international number, many services only support numbers with specific country code).