Metadata concerns? I don't get this one. The entire point of Nostr is to have a public profile.
Discussion
From an analytical perspective It’s probably at least worth pointing out by this person, considering most social media systems people will think of to initially compare Nostr to allow a private profile or are even set to private by default.
(Private in those companies words, not mine)
I should clarify I think public-only is great. I just didn’t realize it until after my npub was generated and I sent my first note in Damus.