Thanks for sharing. There are some good arguments here,* particularly re: servers holding your registration info and some of the downsides of requiring servers for xmpp (though it also has some advantages—it's nice to be able to message someone not online).

*though I'm always a little anti-"pgp can't be used by normal users." If the situation requires the security that PGP provides, users can frequently be made to learn. (That being said, Glenn Greenwald couldn't be bothered to set up PGP to talk to Snowden until someone got him up to speed. [0])

[0]: https://theintercept.com/2014/10/28/smuggling-snowden-secret...