For one off lessons that is correct and by definition in a one off lesson you cannot measure learning.In other words: you don't. If I remember correct, you told me, that your students come for one rather short lesson and then you may go fishing the rest of the day.
I agree, but there are instructors who will tell you that looking at your bc causes poor tracking.I don't get your point. If watching your bc sets off your tracking, then you have poor performance.
I’ll let James know but I’m sure that he has watched lots of YT videos of stepping without learning it.For stepping put a tight horizontal rope on head level and hang on a handle. Start stepping while moving the handle along the rope. Get into the right rythm of stepoing. Thats where most lose it.
Regards
Vince