I think that's an interesting idea, but you hit the landing page and there's loads of syntax thrown in your face and you're like, man, I need to learn a lot.

But I think this kind of brings up another problem, which is that you can choose not to use stuff if you're writing, but if you're reading other people's docs or editing them, then you need to know all the syntax they use. Most OSS projects with markdown docs today, anyone can open an MR to improve them.