I’ve seen it happen, years ago when I was a UX designer in one of the companies I used to work for. A senior UI designer was in a constant battle with the Product Director. They couldn’t agree on anything and they didn’t respect each other’s competencies. Why? Because they were scared to lose ground in the organization. Both wanted to be in charge of product development. Both wanted to deliver an absolutely stunning product. Both thought that their opponent doesn’t understand his own role.