That style of concession stand has really only become common in the last 5-10 years borrowing from the airport concessions industry. But to do it well it takes some infrastructure changes and to add maximum efficiency it helps to have some additional technology.Not what I see.
I noticed they reconfigured at least one concession stand to allow people to go through a line and pick there items and pay at the end. That should help. Why did it take 50 years to try?
Lack of expertise by AD employees?
And yes, this is in my wheelhouse.