I think Ben's tenure as GM was awful, but I will give him the benefit of the doubt that he was learning on the job. If he had finished 4th instead of last in 2014 and 2015, he would not have been fired and maybe he would find some consistent success. He just flushed down the toilet very quickly.
i don't doubt that managers know more about baseball than I do, but that doesn't make them smart or good managers. Most are not very good at managing, making them extremely fungible.