I think the point he's making is if there's 1 relay, it's just twitter, or if you have one you're on of many it's just AP, no need to prove who you are because the source is unique. When there are multiple potential sources that can be amorphous, for people to fetch your messages the architecture needs a way to prove they came from you.
Signatures are useful to prove something wasn't tampered with, yes.
Yea, I understand. I guess I just don't agree with the absolute statement "is only needed because..."
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Well for the nostr protocol it's absolutely true. The only reason you have to have it is because of the client relay architecture. Anything else it gives you is a bonus.
GPG commit signatures are valuable even when GitHub is your only git server.
