Indeed. I think this stems from presumably wanting to support legacy XMPP where possible, email servers and FTP servers are the other two places this option oft

Indeed. I think this stems from presumably wanting to support legacy XMPP where possible, email servers and FTP servers are the other two places this option often comes up. But it should probably be really clear that the correct way is X, and support for Y should be buried somewhere so most users don't have to think about it, if you do feel a need to retain support for it.