This question is an example of a question which is answerable with a single example if the answer is yes; but an answer of no would effectively require an exhaustive knowledge of the subject (speculative fiction television anthology series). Are such questions "non-constructive"?
(The example question was downvoted twice, and I think there was no other issue with the question [except possibly the post-question content might be viewed as trying to encourage discussion rather providing a context for the interest in the answer and the perceived unlikelihood of the answer being yes].)
A similar question was asked on Christianity SE where the weakly supported view seemed to be that such questions were OK; but, of course, different SE sites have different standards.