Back in 2011, in a long discussion which I still haven't read through fully to see whether it's up to date, it was decided that genre-classification questions were off-topic. Do we want to revisit or revise this policy?
What should our policy be today on genre-classification questions?
Note that there are two different types of such questions:
Questions of the form "Does X count as science fiction?" Current practice is to migrate these to meta, under the argument that they're exactly equivalent to "Is X on-topic for this site?"
Questions about subgenre, e.g. "Does X count as hard sci-fi?" or "Does X (clearly SFF) count as sci-fi or fantasy?" This recent example was again considered on-topic on meta and off-topic on the main site, but it was more controversial. In a comment on the now-deleted main-site incarnation, Jason Baker said:
Why, in Aslan's name, should this question be on meta? It has nothing to do with site policy, either directly or indirectly, and its answer will have no bearing on how the site is run. Leave it here.
Such disagreement and controversy is my main reason for asking this question.
EDIT: I'm tagging this featured now in the hopes of getting enough votes on the answers to get a proper community consensus. The motivation for this was the question How well does Inception fit into the Sci-Fi Genre?. Initially it was asked on the main site; I migrated it to meta since the (sort of) consensus at the moment appears to be that genre questions belong on meta (even though I personally don't agree with this), and it was promptly closed on meta as being "not about SFF.SE" (which is fair enough, IMO). I'm reopening it now since it's been edited to ask Why is Inception on-topic on SFF:SE?, but the issue remains of what should have happened to it if it had remained as a question of "Is Inception sci-fi?" Surely we, of all SE communities, should be able to provide a good answer to this question, whether on main or on meta.