I've never used a McDonalds kiosk for the reason you gave. Actually, I think no matter how much you streamlined it with cutting edge AI assistants it would still be faster and more natural to just say "A big mac and a diet coke please" to the cashier. I don't see any end-user benefit to these assistants, the only ones who benefit are the bean counters and executives who will use them to do more layoffs and keep the money that saves to themselves.
With a true GPT ordering experience, you would just say “a Big Mac and a diet coke please” to a speaker just like you would in a drive thru and it would ring you up. It would replace the cashier
This is how it is in Australia at some Macca's with a kiosk, no cashiers at all. You can still request but there isn't people just waiting for you to order.
The guy taking orders does other things rather than just taking an order. Wake me up when chatgimp can prepare my fries and bring the bag with ready food to my car.