Remember, the courts are LIMITED to that which is brought before them. They cannot rule willy nilly just because they have an opinion on something, especially if that something hasn't been brought to them for a ruling.
Well for your first paragraph, I would certainly expect that the executive would follow the rulings of the judiciary. That’s just common sense. Without that, we have no protection from executive overreach. For your second paragraph I agree. Even with cases brought before them, there are jurisdiction questions. No federal judge in East Podunk should be able to rule on the entire US.