The low stance training is the separation between "man" and "boy".
The low stance training is to push your body to the limit. I have always believed that you train just like you fight. But if you don't push yourself hard enough, you can only be on an average level, and you will not be able to move yourself to much higher level.
If you can hold on your opponent's waist belt and throw him over your head (you have to sink very low), when you grab on your opponent's arm, you can easily throw him over your head.
If you can do the following drill. You will have no problem to escape your leg when your opponent attack your leg.
https://www.youtube.com/watch?v=TKCSiZs7RYI