Because melted buffalo mozzarella doesn't hold up to a 15-20 minute car ride. Turning a good pizza into a bad one by leaving it in a car for 20 minutes is a waste.
yeah sorry, not everyone's a liquid millionaire and can eat buffalo mozzarella whenever they please.
we'll try to work harder and make more money, to be more like you, so we can have excellent gourmand-level taste 24/7.