It would be more analog to HTTP not specing out how CDNs should work, or Usenet not specing out how DejaNews is going to work. It's infrastructure stuff neither

It would be more analog to HTTP not specing out how CDNs should work, or Usenet not specing out how DejaNews is going to work. It's infrastructure stuff neither the client nor the simple server has to care about. The Nostr spec covers what matters, cryptographic identities and unique message ids, that make dumb relays that duplicating messages from elsewhere possible (an area where HTTP or Activity Pub fail at).