I'm old enough that I remember when the counters at the grocery store were shaped so the shopper went on one side to the cashier, and the shopper went on the other. The cashier unloaded the cart, keyed in the item, and someone bagged the groceries. First the discount stores started making people unload their own groceries, now it is universal.
I always unload my basket or cart. i put things on the conveyor is a certain order, because I want stuff bagged in that order. I want cold foods together, pantry items together, and non-food items separate from food items.
On a side note, I remember when ATMs came in. They greatly reduced the banks' costs by eliminating tellers and bank personnel. They were a way for banks to save money.....today almost every bank charges fees for ATM use. They still don't have to pay for tellers, and a cost of electronic transaction isn't $1.50 or $3.00. It is simply a profit generator for the banks.
When there are system changes on a national level, that all similar businesses follow, profit is usually the motive. Think electronic ticketing fees for movies and concerts, bundling of services for phone/cable/internet, cable and car "packages" that you must buy to get the options you want, and many other examples. The changes are generally gradual, or not very noticable but have lovely effects of the corporate bottom line.