The comments on https://news.ycombinator.com/item?id=38718544 are proof that we can't make "just apps" and have people use them without knowing that Nostr is a thing. Users must know.
And in fact I think it is much easier to teach people about Nostr than about why your damn app doesn't have email+password login and where is it storing things and how does moderation work without telling them about Nostr.
And when they finally understand the basics of Nostr they will suddenly understand everything about not only your app, but about all other Nostr clients.