There is a tendency, and I do this as well, to focus on our own little corner of the universe. I've learned to recognize when I'm doing this and have been taught by several good Systems Engineering leaders and a senior cost leader to have a touchstone to test ideas against.
This is how the 5 Immutable Principles came about.
A second touchstone are the components of project performance management. In this picture, cost, schedule, and delivered capabilities are independent variables coupled with non-linear dynamic connections. When someone says cost of delay, that's cost. When we hear features it capabilities. Time, deadlines, sequence of work, it's schedule.
