I think the fewer number of people, compared to reddit, on Lemmy combined with the fact that it’s not nearly as well known, plays a huge advantage to the quality of the comments. Not that there aren’t people like that here either, but I feel like the more popular a platform, is, the more it gets filled, proportionally, with people trying to make witty, shitty, pointless remarks that are often clickkbaity and avoid actual discussion, all in the interest of just getting more imaginary points.
Also the process of “enshitification” (not a term I made up, look it up if you hadn’t heard of it) has already started taking place on reddit due to its popularity.