[upofadown]

A short message instant messaging system can not replace a long message offline capable system like email. They are fundamentally different things.

The achievable security is significantly higher for an offline capable medium for example:

* https://articles.59.ca/doku.php?id=em:emailvsim

It is clear to me at least that we are stuck with at least 2 problems here. I have wondered if you could at least generalize the two modes in a way that would allow you to have one client and let the user decide.

[rakoo]

Both Matrix and XMPP can be used as instant messengers and asynchronous long-form messengers. They both have asynchronous encryption, and have had it for years now.