Comment by thepangolino

PGP has one big problem:

Lack of a proper email infrastructure.

And by "email infrastructure", I mean proper support by most email clients contact apps.

The most basic use case seem to have never been addressed. You receive an email with a public key attached. Clicking on it should automatically open your contact app and ask if you want to add it to your contact's details. It should also be synchronizable with cardDAV or any other protocol of your choosing.