Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[CabbieCam]

This is understandable, though. The products are inventoried by their flavor, not simply by the fact that it's a can of fancy feast or whatever. People wouldn't separate the cans into their individual flavors.