Another form of robotic food service in the vending machine. If this method is currently in use, it has not been well-publicized and I have not partaken of its products. Our current vending machines only use mechanical means to serve and collect money around me here.
It takes someone with an idea to start a trend and then innovators and entrepreneurs to make it happen. I have no doubt that the menu will eventually contain a list of ingredients, food value, and the approximate length of time it takes for preparation.. That way a party can coordinate to some degree how long it will take for their entrees to arrive, though the present system of letting some food cool down, or even get cold, until the whole order is done might continue.
I wouldn't miss that 20% tip which seems to be needed even though the service may be less than perfect.
Addenda 4/9: This came as an email rather than comment, so I am adding it here:
"Many decades ago (1962) Jean and I were in Hong Kong on vacation. We were taken to
lunch by our tailor (Charlie Wei) to a local establishment. There, waitresses roamed around
with trays of various food items. The plates were never taken away so that at the end of the
meal the tab could be established by looking at the color bands on the plates. I have to
assume that was a long established tradition."
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