[upofadown]

>no header protection including From or Subject or Reply-to

This is email, not IM we are talking about. There is no good way to do that without a lot of added complexity and hassle once the email ends up in your archive.

>bad crypto primitive defaults

If you mean forward secrecy then see the proceeding comment.

[UncleMeat]

Its not forward secrecy. Its literally that the default ciphers and modes for PGP are a mess and it is so configurable that it is full of footguns.