I worked one place where they brought in a new director who wasn't functionally competent. I have theories of why which are all probably partly true. Like he saw actually engaging and managing his division as a distraction from social engineering a lateral move up the ladder.

Eventually everyone under him in mass went to his boss and HR and told them flat out he needed to go. And the company did nothing for 18 months. And then just pruned him and the whole division of 25 experienced RF chip designers.