Also if you see a specification being broadcasted on a relay you can expect there's a chance that it is being used on those relays. Could reinforce territorial dynamics though. But beyond that, a registry can stand as endorsement of the content, and endorsements of the specifications it links to. Other users endorsing that article can gauge the level of concensus for specifications. Rather than a specified length, it will decay for less known/used nips, Then there is Vitor's demo of running a webserver from nostr events. How can you determine the trustworthy events on a relay where anyone can send events? You can read a registry from a trusted user (at this point, i mean actual trust, not computational WOT stuff) and that can act as a dns server to other nostr events. If we were to computationally do it, we'd need a strong metric that cant be gamable. Otherwise I'd see how that'd be a big safety hazard.