Cynicism? On Reddit!?
In seriousness, I think it's a mix of things. There's survivorship bias--some number of Lemmy posters (me, for example) have left, never to return. So we're not in r/RedditAlternatives speaking in favor of Lemmy. Some of it's frustration over this whole situation. It is very unfortunate things went down this way. And there's legitimate criticism too. Lemmy's got quite a bit growing and maturing to do before it could get anywhere near the size and breadth of Reddit.
But it's also important to realize Lemmy is not going to be a clone of Reddit. It's not trying to and it wouldn't succeed if it did. No one thing is going to replace Reddit for everybody. Personally, I think that's a big plus. There's value in a smaller community. I like that Lemmy is decentralized by design but there also needs to be more diversity on the Internet in general. Some communities will be better served by spinning up their own message boards, going to different sites and experimenting with different formats. Quite a few are going to stay on Reddit and probably thrive for years to come. And that's fantastic, that's what we should've been doing all along.
Singular, monolithic solutions are the real problem, imo.