PGP is the giant, the shoulders of which many modern crypto apps/protocols stand on. PGP was the implementation that brought proper, trustable crypto to the masses. It was a great solution, filling a void where there was no good solution before it.

It's time is done though, for communicating between people. There are many better solutions where you don't need to worry about having the public key of every person you wish to communicate with. You no longer need to unlock your key every time you send a message to "prove" you sent it. The world has moved on to better technical solutions to those problems.

PGP was brilliant for its time. It still is brilliant for a number of uses cases (like verifying your Debian .deb file is signed by a legit Debian person)

However, communicating with people is no longer one of them. People HAVE invented/reinvented how to communicate securely. And the world's better for them having done so.