Sometimes, but very rarely, if only because of FFI as you pointed out. And usually there's something in the unsafe category that lets you break some rules, if

Sometimes, but very rarely, if only because of FFI as you pointed out. And usually there's something in the unsafe category that lets you break some rules, if only to give a pressure release as in the interop reply above. I don't deny the existence of such a thing, just that there aren't many practical examples