When I was working stand-in positions such as after a move, for example retail, my favorite go-to when asked "Whyyyy?" was "I have no idea. No one told me anything." I sometimes miss those days.

You're right though. Most people have enough knowledge to do the steps of the job or task. For many of them skipping a step shuts down that memory, if only temporarily. I've met only a handful of true experts. People who can do things forwards, backwards, upside-down, and mix things up on the fly. They are BY FAR the most uncommon.