Its a bidirectional relationship as well. Maybe I only want to communicate/see users from @mynostrcommunity.com or want to block anyone that does/nt have a NIP-05. Its about enabling optionality and multiple types of barriers. What ultimately makes nostr robust as a whole ecosystem is that there's no single criteria to game. You'll break nostr eventually if there's a singular best & unchangingWoT metric that all relays and clients use. Good luck doing that when every user, relay and client have even 10's of WoT algorithms to choose from.