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@rysiek @thenexusofprivacy with email, you do have to connect to the email server that (federated, not decentralized) DNS records point to. If your mail server goes down, email sent to you does not get to you set up an account on a new mail server and then configure DNS records and hope an eventual retry delivers that mail to the new central point that manages your mail.

XMPP works essentially the same. The servers federate, but are not decentralized. And even if you are ok with calling the server topology itself "decentralized," you still have to lean on DNS, which is absolutely not decentralized.