Companies only want to shift to self checkout because they think they'll make more money.
It's all about profit.
I was fooled, I thought it was going to be better for me. And it was for awhile, because I can check myself out faster than the average employee.
However, the average customer sucks at checking themselves out. So the line for self checkout sucks. Stores use scales to make sure you're scanning the right number of things, but that means that I have to put everything down on a tray, and then put it back in my cart after.
Worst of all, I check out so fast that I regularly get stopped because I guess I look like a thief. No, I didn't steal anything, I just don't want to waste any more of my precious time in this depressing fluorescent establishment.