The fitting is a booked service. Fifteen minutes with a trained member of staff cannot happen while three other people wait at the till, and Saturday mornings only work if those slots exist in a diary.
Measurements are worth recording. Telling a parent that their child was measured in March and has grown a size and a half since is both useful and the reason that family books rather than guesses at a supermarket.
The stockroom is the shop. A pair that exists but cannot be found in four minutes is a lost sale, so where each box sits matters as much as whether it was ordered.
Repairs are somebody else's property in transit. Sent to a cobbler and returned, a customer's shoes need a location and a date, because the alternative is a conversation nobody wants to have twice.