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XMPP hasn't gone away, it's incredibly popular: WhatsApp is built upon it, with over a billion users.

can you federate with whatsapp ? No? Then it doesn't matter

Correct me if I'm wrong, but that's a business-guided choice made by whatsapp/meta and not a technical limitation of XMPP in any way.

That's still irrelevant if you can't use it as XMPP, it also doesn't work exactly as XMPP either.