Hyperbole aside (they won’t drop SMTP) that is a very narrow and unfair view on the situation, they at least tried for years to make it work with these standards and failed. They were obviously the last ones doing so, and this new approach is mainly about modernising their infrastructure. Is there anyone else of any consequence out there who is building these sorts of messaging apps on top of XMPP? Google was the las…
Numerous organizations have deployments of these and other, smaller XMPP IM servers.
As for cherry picking standards, isn't that exactly what you're doing with your statement on Chromium and web standards?