Well, I have ridden quite a few pow skis mounted true center, and here is my take.
Mounting in this position inhibits switch pow skiing. If you think about where your center of gravity is, it makes a bit more sense. When riding switch, you are usually leaning pretty far forward to compensate for the rear tip float. This puts your center of gravity far in front of your toes which is like riding backseat. This inhibits edge control and makes landing drops switch a bit more difficult and easy to pancake.