I sometimes hear that someone doesn’t want to post an idea because they feel like they would have to write a whole post, and it would need to be long, complex, and fully fleshed out.
I think short and simple Forum posts are fine — in fact, it’s often better for a post to be significantly shorter. (You could also consider making it a Quick take.)
I think this discussion will become important in the future. On the one hand, I struggle a little bit to notice every post that is interesting for me. On the other hand, there is the danger that the EA movement starts to fragment if the forum is splitted. Longtermists could read only longtermist stuff, people interested in animal suffering read only posts on animal advocacy etc.