I don't think I have to explain how more people having more available hours to work is a better societal alternative.

It's only better if a human cashier can do the job better. Otherwise, you're just making humans do money-work as an excuse to give them more hours.

For example, I could do everything at work on a pad with a pencil instead of using a computer. I would certainly have more hours!

The reason why that sounds insane is because everybody recognizes that using a computer is much faster and more efficient, so you should use that instead.