There's a qualitative difference between NIP 05 verification and a Fedi server, for multiple reasons. NOSTR relays will accept new content more or less indiscriminately, for one. A Fedi server won't even know a new account exists unless there's already a connection.
Discussion
That's not how any work.
If Nostr does nip05 only, like Ditto, any non-nip05 account won't write any activity.
On Fedi, you can add a Relay or friend, post something, and federate