Why doesn't Ben Simmons finish at the rim with his dominant hand?

Not a knock on this kid because I love his game. This is a legit question. It's great to be able to use your off hand in basketball and the great players work hard on this skill. I know Ben is a lefty because he shoots his free throws and jump shot lefty. He might be ambidextrous but really I've met very few people who are truly ambidextrous. That is they can write, throw swing a racket,etc.... With both hands.

I've watched a lot of basketball this year and I don't truly remember him finishing lefty with a dunk or lay up all year. It is either righty or both hands. Anyone close to the program have any insight?