One more reason: The dish tastes exactly the same every time. No variation at all.
But when you cook real food, there is always a little variation because the ingredients are usually always slightly different (vegetables more or less watery, meat more or less lean, a little bit more or a little bit less salt or flavouring). It's one of the main skills of a really good cook: To perceive the subtle differences during the preparation and to bring out the best possible taste incorporating the differences.
Everyone knows why it's different for him: He is white.