I did ignore my proffesor on my last project. He is mainly a 35mm photographer. He said that it is difficult to compose in a square and he advised against it. But I went ahead and shot with my Rolleicord. I didn't get the best grade but in critique the other students really liked the square and the different point of view because of the waist level viewer. So, I am happy with the project which is actually part of a personal project I am working on.
Your professor is an ass, you should have told him to look at the images of Bill Brandt.