Kairos

My point is that the protocol doesn’t work well for the use case.

And what do you do about other clients? What happens when the user wants to clear messages on the server when they’re fetched, but doesn’t want to do that for the social network rooms? What about moderation.

XMPP is good at a very specific thing and I don’t think its users would like all the necesary changes.

And?

It works better than anything else.

Matrix is too hefty. XMPP is stateless sort of. ActivityPub just works.

That error happens because the room federation sync takes longer than the join client-server request timeout. Just try again.