As mentioned by someone in the linked thread, part of the user problem is that users can't even conceive of a federated IM system and don't know what one might be like. Asking someone to get a XMPP client so they can communicate with you normally just ends in confusion. There is no download button on the xmpp.com site.
* https://mail.jabber.org/pipermail/standards/2017-January/031...