I can't answer the broader question, but I did attempt to use the XMPP gateway for a little while. Many features were implemented in ways that made them hard or

I can't answer the broader question, but I did attempt to use the XMPP gateway for a little while. Many features were implemented in ways that made them hard or impossible to follow when viewed via XMPP (threading was a big one), and there were a fair number of bugs. It very much felt like a tacked-on feature as opposed to something they would have expected to be used in a meaningful way.