This question: How to Garner Mathematical Intuition is (from what I understand) about how to "teach intuition". The question does seem to be off topic because it opens up to opinion based answers.
But the question actually does good in that it cites an academic journal article on the topic. The article seems to outline the "issue" that on the one hand for mathematicians intuition is a key tool, but on the other, intuition might not be taught (see my answer to the question for more on my view on this).
So the question, here, is whether or not this question is on topic. It seems like a completely valid mathematics education question that would fit well with a non-existent RUME (research in undergraduate mathematics education) tag. But on the other hand, I do agree that the answers will come close to being opinion based.
So maybe more specific: Are questions related to RUME on topic?
One might say that the question is off topic because it asks for opinions about what can be done about something that an article has pointed out is a "problem". And so one could say that RUME questions are on topic if they just ask objectively about what has been done in research. But, in my opinion, those two would be difficult to separate since for example here, some might argue that there isn't a problem...