This assumes the EMgr is compensated/recognized more on performance of collective output than on politics and relationships. I dont know specifically about Apple, but plenty of orgs are imperfect enough that relationships are actually more highly rewarded/recognized than optimal collective outcomes (which are disparate and difficult to take credit for.)
This is part of the reason why "glue" workers[1] are usually overlooked and kept back. They neither please anyone, nor have a specific item to take credit for, usually simply boosting the outcomes of others who take all the credit for their work, plus some for that of the glue worker.
[1]: (ones which keep a team functioning well, but do nothing particularly stunning of their own)