Of course, you’re right xmpp evolved to get PubSub extension as an “optional feature” but because of its availability (or rather lack) - most servers didn’t support it even the client did support, xmpp didn’t win the acceptance of the end-users. It got some attention in the business world (cisco jabber) but not in the retail.

That XMPP's extensibility is in itself a strength and a weakness is indeed a valid argument, as you've exemplified. I was expecting you'd criticize OMEMO though...

Business cannot work forever without clients willing to pay or at least use, so it died off even in the business.

No, it didn't die off, it's still used. IRC is still used as well, probably more or less at the same level. But if you define usage as "used in business" well then probably just a few cases, yes.

I hadn't heard of Cisco Jabber but i've heard of Google and Facebook - both companies' messengers were, initially, based on XMPP but they EEE'd it once they got enough users and walled their gardens, dealing a major blow to the protocol.

End of story, try not to fighting with the straw men you created.

Can i fight my inner daemons at least? Please?