The main motivation here is this question asking where to find a list of currently airing anime, including date and time. It can be seen as a polling question (well, really, it is) and might come a cross as subjective, as there may be multiple valid answers, of which you might choose one by preference, but I also think it has (an) objectively correct answer(s), which fulfills the criteria set forth in the question completely.
What should or policy be here? Close as off-topic / not constructive (polling)? Keep them if they have one or more definite answers, from which one might pick depending on ones preferences?
As a tangent, on SO, there may also be multiple solutions to a specific programming problem, and you pick one that fits best depending on your demands and / or preferences.