YEP! You are getting on to what I am talking about, but in visual form. Brilliant!
Fun fact, if you are a arm player, you will find that you cap out when you move the arm to the right, and if you are, you will require to move your whole mousepad in the middle of each limit point, making your mouse and mousepad angled, and towards you.
Otherwise, if you are an arm player, you have to do the same calulations, but your limit will be how much you can move your arm to the right, using elbow as pivot point.
If you are a wrist player, you follow the guide and use the limit point of moving to the left, using base of wrist as pivot point, like the image describes.
But yeah, you now get my point!