I think a lot of people miss the point, and the trainer here actually says it in so many words: it isn't supposed to be efficient, it's supposed to blow the minds of the customers (I.e. "magic").

Similarly, I'm often blown away by waiters that don't write my order down AND get my meal completely correct, the showmanship makes it a funner experience.

WH without this system is just very good drunk people food.

E: I worked at WH for a couple years, watching the cooks in action is just plain impressive. Especially when there's 10+ plates lined up, they're marking more, managing to not burn already cooking food, AND plating orders.