If you had the authority to fulfil your responsibilities, you probably wouldn't care about getting promoted. As it is, you think that after the promotion, you'll have the authority to fix what needs fixing. And maybe you will - for the things that used to be your responsibility. But you probably won't do it, because you will have a whole new set of responsibilities. And you will be real busy, becasue your new authority won't be quite enough for your new responsibilities.