What is the purpose of adding oil when cooking scrambled eggs on non-stick pan? Today I had… hard conversation with my girlfriend whether to use or not oil (semi refined sunflower) when cooking scrambled eggs on a non-stick pan.

My point is that there is no reason for oil, because coating of the pan will prevent eggs to stick. Was I right or adding oil is essential for some other reason than prevention eggs to stick?
I always add butter, as much for the flavor as to keep the eggs from sticking. In scrambled eggs, butter is as necessary for me as salt and pepper.