It's insane that, almost two years in, there is not a single Nostr NIP marked 'final'. They are all in 'draft' state. Yes, even NIP-01.
Discussion
Nostr is a community-driven network. There are no default implementations that define the protocol for everybody else. Therefore, stability of the protocol specification is even more important, lest rapid breaking changes isolate some parts of the network that are unable to keep up with others.