As others have said, it doesn't quite have the user base to reach critical mass. A lot of my old favorite subs aren't here.

Also...the user base isn't as diverse. I used to click through to see the comments on Reddit to find those comments that provided fresh perspective, gave more context, or explained nuance. You'd click on some thread about Trump's latest legal troubles and get some real information about why things are moving slowly or why the defense made a particular choice. Or go into a thread about some upcoming video game being cancelled, or Google plan being changed or whatever, and get an actual analysis about how the financials don't work, or maybe how the market changed, or how some users were abusing the system.

On Lemmy, I often find myself just skipping the comments. They seem much more uniform, all just repeating the popular line: variants of "Ha, fuck Trump!" "Lol, Russia sucks!" "Company X doing this should be against the law!" etc. I can usually predict what the comments are going to be without bothering to read them, and rarely do I come out with new information. It feels much more like an echo chamber.

Part of it is just that there's not as many users, I think, so there's just not as many posts and thus fewer 'gems'. Also, I think that the users who made the effort to migrate from Reddit probably skew younger, tend to be more uniformly left-leaning, and a larger share will be students or programmers as opposed to lawyers or carpenters or auto mechanics.

The especially annoying thing is that the same thing seems to have happened on Reddit. Yeah, I still moonlight there when I run out of content on Lemmy. And the number of comments seems to have dwindled, and the viewpoint diversity seems to have narrowed there, too. Maybe the normies just gave up and left.