This could be added to existing nostr, but isn't there.
If relays had identities, we could do a lot more interesting things:
We could ditch DNS and have servers sign events tying their pubkey to their IP address (and port), and then track servers by pubkey instead of by URL. Servers could move around and we would follow them.
Users could develop trust relationships with relays, and this couldn't get rugged or impostered by DNS registrars
We could ditch TLS, ditching the certificates authorities that nobody should be trusting anyways
This could be added to existing nostr, but isn't there.
If relays had identities, we could do a lot more interesting things: