I think that is one of the least likely to fail parts of the internet
Discussion
It's reliable, but it's trivially censorable
Censorable, to some extent. ccTLDs exist.
But an ISP can prevent you from looking it up. And if you can look it up, it probably resolves to something they can IP block. And if they somehow can't, it certainly can't resolve to an onion service unless every nostr client is using tor
Whereas NWC... you can spray packets across relays asking someone to make you an invoice. Then anyone with the private key can respond to them, even if they're behind tor