This is one of the few things that always annoyed me on StackOverflow: people use CW as a kind of catch-all options under which everything is allowed.
If there's any kind of controversy about a question, it's marked CW and then it's supposed to be ok, even if the question is entirely worthless. If there's the slightest hint of subjectivity or open-endedness to a question, people will post comments DEMANDING it be CW'ed. And then we all pretend that doing so actually solved a real problem.
But those policies/traditions don't have to apply here.
So the question: What are we going to use CW for? How widely should it be used? For example, should subjective questions be CW'ed, closed or left alone?
If I ask "what is the best package to use if I want to do [X]", or "which editor do you use to write your LaTeX documents", should those be CW'ed? Closed?
What if I ask "how do you structure a large (150+ pages) document so it's easy to work with?", or "what is the most popular documentclass"?
What (if anything) should be CW'ed? Which kinds of questions should be closed outright? And why?