@user21820 I don't really know how easy or not it is to by-pass it. But in any case it is not a situation of "ask us when it is needed, and we'll help" which is the case for some other things. It's "we don't migrate old stuff."
I think I see one possible reason. If questions should be migrated based on the scope, then it may be that future SE sites that cater to a particular specialized scope may become more suitable for a significant chunk of questions.