Podcast might be a bad example for my argument because with show notes there is no medium switch 😅

Billboard, magazine ad, conference talk, word of mouth, t.v. commercial, etc. Anything where you can't just click a link or copy and paste an npub.

BUT OVERALL, I agree with your point. Npubs + network should be good enough for most use cases.

I just think a NIP-05 — or something better thats human readable & memorable — can add value for at least two edge cases that come to mind:

— Medium switch, solving the "radio problem" people have with bad domain names.

— No overlapping networks, whether its simply a new interest (like newcoiner) or a newly established npub for creator/consumer.

Definitely not necessary, but can still be useful.