That's not what I said.
What I said was that they have no answer that falls within our scope, because the expertise they require is not derived from Science Fiction or Fantasy. So when we get questions like that, they are soft questions by default and they become invitations to discussions.
If you ask,
Can X happen in the real world?
There is no work of science fiction or fantasy that can tell you the answer, which makes such questions markedly different than the tons of in-universe speculation questions we get here.
Now, there likely is a scientific work that explains the answer, but that's not our domain nor is our audience intended to be experts in hard science (i.e., we're not "Science, Science Fiction, and Fantasy").
So our whole reason to be, the reason why people come to us instead of any other site, is negated and our established expertise on the subject is no different than any other message board or forum out there.
Stack Exchange has a number of hard science and math sites where such questions would be on-topic and have the appropriate audience:
Those sites should get those questions, not us.