Due to being expected to only order the bare minimum, storekeepers no longer actually plan ahead for busier times and just make the same or slightly different orders all the time. People who try to order more are not selected to be promoted and will be reprimanded. Every place is a gig rather than a career, so people don't get to learn the optimum way to do their job. Lots of machines can only be fixed by the company that makes them, so it's harder to develop expertise on different machines and most end up just following the manual they were given. big box book stores killed of a lot of heavily read bookstore keepers and staff. I'm not saying it was all perfectly rational and amazing, but knowledge of the job has been intentionally killed as part of the growing disdain for any work that's not for the wealthy, mostly so it can be said that this work is low education.