Yeah. I used to work with it a lot. It basically has similar problems as email but without the momentum. It's complicated to run an XMPP server that actually ha

Yeah. I used to work with it a lot. It basically has similar problems as email but without the momentum. It's complicated to run an XMPP server that actually has all the features you'd want, including properly configured C2S and S2S auth, and even then you're missing important client-side features unless you get clients in agreement (see: iChat). Imo they needed to be stricter about what constitutes a standard XMPP server, especially with security-related stuff. Look at how browsers managed to ban old TLS versions and discourage plain HTTP. And less important but just annoying, XML was a mistake that they keep defending. Really only made sense for rich text message body, which nowadays nobody cares about either. I've seen a project where they just shoved JSON into it and called it a day.