We have no problem with questions about completely imaginary scenarios that provide an interesting angle on aspects of Judaism, provided, as with all questions, that they're asked well. It seems to me that the same value applies to questions about scenarios that come explicitly from fictional works.
One extra caution I'd suggest for scenarios from fiction is to make sure that ultimately, there's a clear question about Judaism as applied under a specific clear circumstance, as opposed to a question that requires extensive analysis of the source fictional work itself, since then, the question is at least as much about the fictional work as it is about Judaism and is potentially not in the general interest and not answerable based on expertise in Judaism.
Regarding the specific question you linked to, as I commented there when you posted it, I think it's missing specificity as to what Judaism issue[s] it's asking about. I've now voted to close it as Unclear.