Well, you have to figure out the direction of crank rotation first (or maybe they have a clutch and disengage in the opposite direction, I don’t know. I was able to hand prop a small plane but I see few kids needing that knowledge today). But seriously, I don’t see the present day purpose of that knowledge (unless you own or work on a Model T), same with points and dwell (I do need that knowledge for a motorcycle and outboard), same with rotary dial phone, same with analogue clock (unless by slim chance you have to rely on one exclusively or collect them), and the other archaic stuff. My late wife used to teach the grandkids how to read the clock but gave it up with the younger ones as there seemed to be no point. All those examples are just specialty or hobby knowledge now.
Loading film on sprockets in a camera would be another one. What’s film?