I don’t buy the idea that this creates uncertainty. When I read a statute I have a level of certainty as to what it means. When I read executive branch rules interpreting the statute I have a better understanding of what the executive intends to do, but - as they don’t write the law - it doesn’t provide much clarity as to what the statute actually means. The executive can and should continue to provide guidance about its intentions, but saying that the law is whatever the executive intends it to be is smoke.