I came across this answer on Meta Super User which is a link-only answer to this question on Meta Stack Exchange. The question on MSE is asking exactly the same thing as the question on MSU, so both question need exactly the same answer.
According to the answers to this question, link-only answers are bad, so my first reaction when I saw that answer was to downvote it. But then I saw a comment saying that the answer on MSE could be changed, and in that case an advantage with having a link-only answer is that the answer on MSU wouldn't have to be changed as well. Then I looked at the editing history and I saw that the original answer contained the same thing as the MSE answer and then was edited to become a link-only answer. As I think that the explanation in the comment of why it was a link-only answer is good, I didn't downvote the answer, I even upvoted it.
But even though there was a very good reason to post this as a link-only answer, link-only answers are still against the rules. So my question is, in cases like this where a question on per-site Meta is a cross-site duplicate of a MSE question, are link-only answers acceptable although they're usually against the rules, or are link-only answers always bad?