It’s true, that’s the advantage of a larger user base. But when I compare my homepage of Reddit after 15 years of refinement to that of my lemmy homepage after 1 year, my lemmy one is way better. Most of those niche communities devolve into memes and nonsense like the same questions being asked over and over and over again after a while. Great for searching, but for actually getting content on a regular basis from, mostly a waste of time.
Try living in a small country, there’s tons of stuff like that.