It might be noted that this move to automation occured _without_ an increase in the minimum wage.
i.e. they are doing it because it can contribute to their bottom line and "enhance" customer satisfaction.
-- time to order in this kind of business is a large part of the expense, hence why they flocked to credit card systems to lose ~3% of their revenue, because it essentially eliminates cash handling time and balancing the books at the end of the shift (for that portion of sales).
(just out of high school, I worked at a Burger King in the drive through (1992). You had to make change in my head,. I could do it without error. Most others could not)).