I think the problem is that, for a lot of people, the mechanics of table use are sufficiently complicated that that's where they focus.
That is why the Wheel was so awesome (NAUI even developed one, though not ML)! My daughter is dyslexic. The tables are a challenge, though she can describe what is going on to the human body (she is 11). The Wheel and the NAUI version are a simple tool for her (as will be a PDC).