It boils down to the fact people generally don't want change, but they don't want Reddit.

Some people complaining about Lemmy want it to be "Reddit 2.0" where Reddit 2.0 is the same and better than Reddit without realising that work has to be put in to make it better, and that better inherently means it cannot be the same. They want their cake and to eat too.

As for me, I'd prefer to think of Lemmy/kbin/fediverse as the next step, not the same as Reddit, but serving a similar purpose. And because we're just getting started, as a developer I know there's going to be more kinks that need to be worked out, so I stick with them.

I'm not expecting Reddit to fully disappear either - many people just won't care, they want to be where the people are, and currently Reddit is where the people are. They won't move untill there's enough people, and by then the platform should have already stabilised. You'll know when Lemmy hits the mainstream when it's mentioned regularly in passing in news articles as a source, not like this "what is Lemmy or what is the fediverse" article barrage were getting currently.