A True Understanding

Erdnase mentions that a proper understanding of the workings of a move is required to learn the move, and that this understanding will reduce the amount of practice time required. But when and how does one gauge when a move is truly understood? I believe I have a means to accomplish and measure this. When you learn something in Erdnase and you no longer worry about the technique but start concerning yourself with the minutia of the move, for example, with the blind shuffle I and II to retain top stock. Why does method one use this large cut? When will it be used? The second shuffle seems more deceptive at first glance. Well although this is all fine and dandy, one starts to think about the move beyond the technique. So if one is surrounded surely you can not perform Blind Shuffle II with a break. Furthermore, in discussion with a magician friend he asked why I vs. II and when? Another thought is that the deception can be just as great if the top stock maintained is relatively small and your actions are very smooth. The last packet thrown on top from below the seperation if only 10-12 cards doesn't look so choppy and it doesn't look like such a significant cut is made perhaps only matter of fact-ly done.
When details like that are considered I believe the understanding Erdnase referred to is attained. Time will enable one to understand the entire book that way! I am going to go sit down with my card conjuring compadre right now.