Keys are the biggest reason why I think Nostr will not reach mass adoption. Not keys themselves, but the fact that if your nsec becomes compromised, then you’re just fucked - no way to recover your npub.
This is a big problem for a social media use case, like what I’m using Nostr for.
I don’t so much care about the “other stuff”. It’s just not that interesting to me - at least not yet, but maybe someone will build something cool that I find useful.