Yes, clients can look for recent events kinds of each protocol.

But the issue is that all clients must implement all protocols, which is never going to be the case.

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No they don't. Clients should remove NIP-04 right now.

I agree.

I agree they should remove nip-04 support.

I also agree that at this point NIP-17 is the easiest thing for everyone to implement as base.

Not that I think every Nostr client needs DMs. The majority should never code any DM.