nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 's main concern was to keep it simple.

We already have one way of NIP-05 checking through HTTPS/json, so he didn't want to add a new way through DNS:

https://github.com/nostr-protocol/nips/issues/146

https://github.com/nostr-protocol/nips/pull/29