This is different from what I learned from my teacher. In "standard hanmi" there is more "weight" on the front leg than on the rear leg. And our axis is not in the middle of both legs.
My teacher would argue with your teacher. He would say that a stance with more weight on one foot or the other is inherently unbalanced, and therefore vulnerable.
The proposition is testable. Stand in hamni and have someone push on the middle of your chest, and then on your upper back. Experiment with different weight distributions and see what happens.