I have noticed a sea change recently with respect to the kinds of questions that can be asked on StackOverflow.
The community consensus nowadays seems to be that discussion/subjective/poll/more than one answer questions are no longer appropriate on SO, which would eliminate any questions that might otherwise be saved by marking the question Community Wiki.
Yet some of these questions continue to survive, because the community finds them fun or interesting.
If the only questions that can be saved are the questions that are fun or interesting, why do we continue to insist on the discussion/subjective/poll/more than one answer standard, if it cannot be applied objectively?
If the standard can be applied objectively, and all such questions are eliminated (using one of the close reasons) then why do we need Community Wiki?
If it is a judgement call, which I suspect that it is in a substantial number of cases, why do we tell people they are not following the standard (or let the question slide), when in reality we simply like or dislike the question?