Nostr is promising, but still young. Some important problems (e.g. spam) have not yet been solved. Nostr is a flexible protocol, so there's a good possibility that those problems will be solved eventually.

I think there is, at the moment, a little bit too much hype around Nostr. It's not ready for the main stage, because the available software is too new. It's great that Jack Dorsey has contributed money to development of Nostr software. But we shouldn't pile onto Nostr as if it's a finished product ready to be consumed by any rando off the street.