I believe I experienced something like this a few years ago when I was in Okinawa. You saw a big display of plates/dinners on the outside of the building. You made your choice and went inside and gave the number to a clerk. In no time at all the plate was brought out. You paid for it and looked for the place to eat. Fortunately there was most often a place/table inside. In any case(s) I found the food and service quite satisfactory.
The robots that are coming are not like that. It will be most interesting to see what the final form of fast food service will evolve into.