same here! They discourage me to take control of my campaign claiming that they have information that is not accessible to me, which is necessary to optimize.
I am optimizing one of my accounts and i take into consideration dozens - hundreds of leads stats. They are optimizing a second account but i can't understand how do they decide to pause an ad variation while it is almost not tested and raise the bid for another ad variation (in the same placement) that converts awfully (much worse than my CPA goal) with 2 or 3 leads, to let it run alone. And many other similar optimizing decisions.