I think it goes a little beyond being "just bitcoin content". It's true there's still a LOT of bitcoin content on nostr, but one thing to also note is most of the popular users here are vocal bitcoiners. Not only that most of the recommendations of who to follow to new nostriches are... vocal bitcoiners. But like you said, until there are communities of normies that not only join, but stick around to actually use nostr, that problem won't be solved.