By moving the cables to the cams and placing as close to center as possible the cams will pull straight down on the cam. By shaping the cam in a certain way this will also aid in making sure the cam turns straight over without cam lean. You'll have to read the literature from Ross and Bowtech if you want a more technical explanation since I didn't create the design just understand what they've done and why it is a smart idea.

Why use a band-aid system of tweaking cables sides and such when it is not required with a proper design?

Each cable on my Allegiance is only 38" long. That adds up to only 76" of cable. That's not significantlymore than just about any bow.All cables cross twice on most compounds whether you have 1 continuous cable or 2. Therefore, I'm not sure how you determined that there is significantly more length? Is there design on a single cam bow that just has 1 cable between both the idler and the cam with out crossing back down?