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Have you ever used a drive through? Yes, most fast food menus are too large for that to be a practical experience from inside a vehicle.

Orders are very complicated, far too complicated for buttons. Remember everything is customizable down to individual pieces or ingredients.

The reality is human are just very fast. A good fast food order taker can processes complex orders almost instantly. The muscle memory developed on the POS is very real.

> Is their menu so large that you can't just have a menu with a push-button next to each item?

Items can be modified, and there's not enough buttons for every combination.