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The reasoning is pretty simple, closing a question as a duplicate of something asked in the past that didn't get an answer either is .. rude, and often self-defeating. It basically says "That person has no chance of getting an answer, so we'll make sure you don't, either" This makes sense nearly universally. But this is a research level site, and I realize ...

Yes, one should be closed as off-topic, and migrated to the other site, where it can be closed as a duplicate. It's a bit painful that we can't close as a duplicate of a question on another site, but that's the present state of things. I think the majority of cross-posted questions will be off-topic for MO and on-topic on MSE, but not all. I see you're not ...

Per the OP's request I am posting information from the above comments as an answer. (Although personally I think that this addresses the OP's concerns only partially.) In some cases questions can be merged. Merging is possible when the notation and terminology in both questions are identical, or at least similar enough that the answer still makes sense even ...

The suggestion in this post is only about cross-posts, by which I mean that a user posts the same question at the same time on both sites.1 But very probably this is the same thing what the OP meant by cross-post. If the questions is left on both sites and it is, for example, closed on MO and answered on MSE, MO will be left with the closed question. If the ...

One, perhaps silly, approach would be to put an "answer" on the original question (thereby bumping it on the front page) stating that this question has been re-asked (and give a link). Then the new one could be closed as a duplicate, thus linking back to the original question. The spurious answer could be moved into a comment to maintain the link to the ...

We have merged questions before. I seem to remember doing this many years ago in order to remove some unwanted consequence of a bounty (but I am unable to find the relevant discussion on the tea site). As you might expect, the text of one of the questions disappears forever. Edit in response to Martin Sleziak's comment: It seems my information is well out ...

What about the option to merge the original with the duplicate? If the original has no answer then the merge should be pretty straight-forward. The new question could have the wording of the original and the wording of the re-ask, perhaps under separate headers. The merge could also port over comments from the original thread. I don't know if the new ...