They’ll keep someone in the truck for maintenance purposes. A self driving truck wouldn’t be able to change a flat tire for example and it would be more efficient to have the human driver change it than wait for someone to come out and change the flat.
I like customizations on the touchscreen. I’ve had several experiences where I tell the cashier what I want including customizations only to get my order and realize that the order wasn’t entered in properly. The touchscreen ensures that the order is at least entered properly.