I’d say it’s relative. If you’re the predominant thing on the whole all feed on a proper instance, it’s probably much. Doesn’t matter if the actual number is 1, 2 or 400.

I’ve heard people leave Lemmy on their first day because “it’s just meme pictures”. That was also one single community having way more posts than the other communities. And Lemmy defaulting on showing all the local posts instead of subscribed communities.

And it can kill engagement if things get monothematic. And dominated by one user or a niche topic. But that’s not always the case. Depends on the community. And I can’t say if it’s the case here.