I find myself wondering if us janitors should really be on a campaign to eradicate CW questions entitled 'hidden features of X.'

The subject matter is on topic. Some people seem to learn from them. They sure don't have a single acceptable answer, but, isn't that one of the less offensive uses of CW?

OK, the strict construction is that CW question should still ask a question with a single answer, just one where it might be a team effort to construct the answer. Has anyone ever seen this actually happen?

Sure, the meaningless votes become a popularity contest, but, well, where's the harm?