A lot of this is probably down to the idea that nostr is a replacement of twitter, but what is really meant by that is specifically bitcointwitter, imo. Primal sidebar feels like an exercise in appealing to those who miss bitcointwitter content lol. I think there's growing demand for other stuff (non-bitcoin content).
I think a lot nostr makes sense through this lens. Nostr is successful at replacing bitcointwitter.
So yeah it's an adoption issue too, and the unofficial algos and meta incentives (zap nudge unit) reinforce this.
I'm agreeing with everyone lol