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 like when writing advice is self-demonstrating.
Jup, would have been even funnier if the post content was just ".", but perhaps this wouldn't have helped that much convincing people that short posts are ok. xD