>A protocol moves much more slowly than a platform. After 30+ years, email is still unencrypted
Traffic between email clients and servers is encrypted so can be emails themselves; PGP can be used for encryption of emails and authentication between email senders. But another story is majority of people do not use PGP because of its bad UX.
Running email protocols over TLS isn’t an improvement to the protocol, it’s tunneling. PGP isn’t an improvement to the protocol, it’s encapsulating data in another protocol/format.
Your comment proves he point; email has evolved so slow we’re running it through tunnels and embedding PGP encryption to overcome the weaknesses that the protocol has not been able to fix.
Traffic between email clients and servers is encrypted so can be emails themselves; PGP can be used for encryption of emails and authentication between email senders. But another story is majority of people do not use PGP because of its bad UX.