I have never experienced a faster checkout with self checkout.

If it's super fast, it's just for a few items, and a cashier would've been just as fast. If it's for a lot of items, there's a decent chance I have to look up some codes or something; which a cashier is better and faster at.

The trade off of self checkout is cost savings for the business. These savings are not passed on to me. Therefore, I don't give a flying rat's ass about them.

I'm with OP. If I'm working for the business, they will compensate me. Willingly or unwillingly.

IME it's faster because the queue is shorter. You can fit about 2.5 self checkout machines in the same space, enabling more people to checkout in parallel.