I'm glad you found this note! I still stand behind this although I think it's gong to take way more than a slick client. I think most notably it's going to need to be transparent (nostr stuff mostly hidden) to the user as a formal communication channel. When using nip05, for the most user friendly experience, the UX could be nearly identical to sending an email. The added benefit is that users can use my pubkey or other identifiers.