I’ve noticed that for many LW posts—and EA posts to a lesser extent—it’s very common for a comment on them to get more upvotes than the post itself. Since it’s usually a lot harder to write a post than to comment on it, it seems like this isn’t incentivising people to post strongly enough.
This also seems to apply to facebook posts and likes in the LW and EA groups.
I think that people making more top level posts makes the community better off. I think that a new post that someone has put work into tends to be a lot better content overall than the top comment that might just be stating what everyone else’s immediate thought about this was. Top level posts are also important for generating discussion and can be valuable even if they are wrong for that reason (though obvious they are better if they are right).