[notadoc]

That was my first thought too, and that applies to nearly every fast dining or fast food restaurant, not just in San Francisco or the USA, but also elsewhere in the world.

Many fast dining restaurants exist where you order your own food at a counter, they call your order name/number, and you bus your own table. It's fast and obviously must be efficient for the restaurant otherwise they wouldn't do it. I don't see a problem with that either.