I can say from my observations as a consultant who has worked deep inside over 30 major US corporations that MOST managerial decisions are not made in the best interest of the company, but for a myriad of personal/egotistical reasons.
The worst driver is supposed "cost savings". Seldom properly measured or proven. Just put the number you need it to be on a spreadsheet or power point presentation.
Most management gets rewarded for things other than the best interest of the company.
Promotions, bonuses, assignments, prime office space... it goes to the BS'ers and self-promoters who never, ever consider the benefit of the company in their decisions.