@penllawen @aral Found https://daringfireball.net/linked/2023/06/26/xmpp-google.
He claims that XMPP was doomed because it was instant messaging, and
instant messaging is dead because it doesn't have persistence. I call
malarky. Offline storage has been a thing in XMPP for a loooong time
(long before Google stopped using it in Google Talk). Dependent on server implementation of course.
XEP 0160, "Best Practices for Handling Offline Messages", goes back to 2005.
Version 1.0 of that document was released in 2006.
Perhaps take this person's take on federated protocols with at least
a grain of salt or a serving size of your preference.