Whenever you post an idea, you might get a few upvotes, but you'll also get a lot of comments saying that something else is a better idea instead.

Not just that, but you also get a lot of comments nitpicking a minor detail that hardly affects the main points. For me, at least, that sort of response discourages to post anything that isn't perfect (which nothing ever is).

we need someone crazy like Scott Alexander who will solo producing huge amounts of content 2

You don't necessarily need one person. The Sequences started due to a conversation between Yudkwosky and Hanson.