@ibboard
The impossibility of onboarding users that don't have a client installed is exactly why I had to write https://github.com/modernxmpp/easy-xmpp-invitation and expose it through the #xmpp client's "share link" functionality. The sad truth is, we can't force the major platforms to care about any uri schemes invented after https:.
Feel free to compare the UX of xmpp:georg@yax.im vs. https://xmpp.link/#georg@yax.im to see where you'll end up.
@tknarr @timbray