Why in the year of our lord 2022 am I still getting robocalls???

[HariSeldon]

10. A big part of the "why": authentication

It is really hard for a digital device to reliably identify the party on the other end of the connection. We have a system that more-or-less works for the World Wide Web (TLS)...except if there is DNS cache poisoning, or if rogue certificates are issued, etc.

Effectively implementing remote digital identity would require, at minimum, a centralized coordination for exchanging and attesting public keys. In today's world, who would be trusted to do that? And any leak of the corresponding private key would allow impeccable impersonation, a significant and very fragile condition for accepting this authentication. I'd say it's better to leave people guessing whether they are talking to someone legitimate than have the communication technology incorrectly verify the caller's identity.