Yeah, somebody probably says things like that - but I gotta believe that selling groceries is dam near rocket science. There are millions and millions of possible products that can go into a grocery store and they need to figure out which ones. Store locations, size, configuration, staffing, etc. Then the pricing (regular and sale pricing), resupply and lead times, managing 93k employees, etc. Then on top of that, it's an industry with pretty slim margins on most products due to competition. They have to determine what their customers want and try to put on a competitive price but still have a decent margin.
Incredibly complex business IMO.