Often questions are closed as off topic for the following reason:
Questions seeking scientific solutions or explanations are off-topic unless they relate directly to a cited work of fiction. There are a number of other Stack Exchange sites dedicated to answering questions on non-fictional sciences.
To me this seems clear. A question such as "how does time travel work in Stargate SG-1" would be on topic, but "how would time travel work" is off topic.
However I often see questions that are about specific Sci-Fi works, but are still closed. Take this question about Stargate SG-1. It seems to me that this fits the criteria of unless they relate directly to a cited work of fiction yet I regularly see questions like this being closed.
So should it be changed so that all scientific explanations questions are off-topic? Or is there a reason that a lot of these questions are still getting closed?