Essentially, because voting activity on SE:AI is still sub-optimal, it's rare for a question to recieve 5 close votes from the community.
(Here the community refers to non-moderators--mods can close at will.)
I personally like this because it's better when closures represent the will of the community, as opposed to the will of an individual moderator, in all but exception cases where the question or answer clearly causes harm.
Note: I only feel comfortable proposing this b/c members of our community tend to adhere to the "be nice" policy, and are generally seeking to help the OP by asking for more clarity.