[upofadown]

>PGP emails doesn't even have forward secrecy.

Yeah, that is a bit of a mystery. There is no technical reason. I think that email users just want to keep their old emails around, which of course makes forward secrecy pointless. Perhaps PGP users would prefer to use the greater security available for the private key material in an offline medium like email to make it so they don't get compromised in the first place.