A few months ago, I asked a question on teaching engineers mathematical thinking skills over at MSE. I also asked it a little later at The Mathematics Teaching Community, but traffic on that site is very low. Now that we have MESE, I suspect it would fit well here, but I hesitate to post the question on a third site. How does the community feel about posting the question here?
I think it is fine. Just link to the previous questions, and perhaps summarize what answers you've gotten.
Thanks for asking. Generally speaking, I think significantly delayed cross-posts are not a problem (and in any case we should not be very strict as this stage of the development of the site). I would consider it as good form to acknowledge the pre-existing questions in some way, either by just linking them or perhaps preferably by incorporating what was already learned from earlier answers in OP (if this is feasible).