Agreed. On a related note, I wonder with the extra efficiency gained from no checkout lines, how much it would offset lost revenue. In other words, if, say, you are able to serve 20% more customers, even if there's 4% more loss from tech bugs (not considering shoplifting), the fact that you're moving more people through the store might make up for it.

If someone buys 45 items, but 3 dont ring up, as long as the 3 were relatively cheap items like a can of beans, as opposed to a $15 jar of spices, does it really matter ? Over time, the system will learn which items "go missing" most often and focus on them specifically for better inventory mgmt.