I think it's perfectly understandable that some people like talking to lots of people, and that talking to far fewer people would make them sad.
Discussion
It's a difference between the desire to talk to lost of people who each are less powerful on average and to talk to a few highly motivated and action oriented people on Nostr
Each has value and it's not much more effort to do both
Could be if nostr gets to 100k daily actives in the next little while and retains a bitcoin focus we'll start to see some crossposting. But that's quite a big ask.
cross posting is not a big undertaking and we already see it today
Depends how you see it.
These days social is just as much about replies as posts, and you can't 'cross reply'. You have to manage two separate reply workloads. That can get heavy.
And, as that meme guy Corndalorian has written PhD-thesis length posts about, if you're active on nostr you have to be active in a nostr-native way or else don't bother. Why take the heat? Look at all those that came, tried to cross post, and then noped on out.
And third the quality of interaction here is only good in patches. Often it's pretty low, a barrage of LFG!, or Be Humble®, or laser-eye memes, or parroting this trend or that, not real debate at all. (Or just the void.) Gotta be a bit careful when we talk up the quality of interaction here versus X.
Plus, as mentioned, there are so few people here. Bluesky is tiny, and nostr is over 100 times smaller than Bluesky. It's hard to express how small of a group we are in terms of being a "network".
I'm thinking it's on nostr to find ways to grow that don't rely on shipping in these thought-leader types.