I think it's the way the algorithm works on Lemmy. I was on Lemmy.ml for a bit initially (until I found the tankies...) and yeah the front page didn't change much at all even federating with other Lemmys. But I don't think it was from lack of content. When I switched to Kbin the posts would cycle much more frequently and since Kbin enabled federation it's really felt like there's enough here to replace my Reddit scrolling addiction.