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There are good clients. Whatsapp, Grindr, Kik, League of Legends, Fortnight, Eve Online.

They have something in common though: not letting users communicate outside their own ecosystems.

Good clients which let users communicate outside their own ecosystems: Gajim, Dino, Conversations, Monal, Movim, ...

For what it's worth, Grindr's chat hasn't been powered by XMPP since April 2024.

Please elaborate. Why? What is it using now?

They switched to microservices written in Kotlin, resembling the rest of their backend stack. They had an easier time hiring and retaining Kotlin developers than Erlang/Elixir developers.

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