nostr's second subject other than bitcoin twitter favourites is development.

that's because this is how nostr devs are communicating with each other.

not only that, as you will see if you drop tags and urls around about problems you are having with some app or other, eg alby, various lightning wallets like zeus and so forth, there is people popping in to offer support.

the topics of discussion will widen when the platform gets more narrow and subject-oriented clients. probably the same for narrow and subject oriented relays, and specific sub-protocols such as for example the logistics idea i mentioned there.