I recently came across something which struck home for me in Looking for Superpowers Preferably Physics Based. In the comments, the author commented that it seemed a bit arbitrary that we don't allow idea generation on WB.SE, and that he'd like if the rules were posted up front.
Now I understand why we don't have idea generation, but his plight echoed mine when I joined WB. Its not clear that rules even exist until someone comes by and slaughters your question with some "no idea generation" rule which you couldn't find anywhere.
Does SE offer any way to make those rules more visible to a new user? It bothered me that I couldn't find a good way to find the "rules" of the SE when I got here, and it clearly got to the author of that post as well.