This question is not a good fit to our Q&A format. We expect answers to generally involve facts, references, or specific expertise; this question will likely solicit opinion, debate, arguments, polling, or extended discussion
What specifically was "not constructive" about the following question based on the definition above? I think this was a completely baseless closure.
The question did NOT generate "opinion, debate, arguments, polling, or extended discussion". It did, however, generate a very precise solitary answer, which completely answered it and provided useful information.
The only discussion it generated - in comments - was definition of "fanfic," which I think most reasonable SciFi&F people don't consider controversial and was very precisely defined in the question itself to avoid any ambiguity; and, moreover, fanfic questions were explicitly agreed on meta to be on topic previously.