Great article! Like many of you I have worked with great teams and bad teams. In my experience a great UI/UX is a sign of a great team/company with a clear focus. The designers and engineers cannot fight for whose approach is superior, they must respect and understand each other and the user intent. They have to communicate well and sometimes invent new options together when their views or constraints are in conflict. This requires talent, teamwork and a focus on excellence at a level that cannot be faked.