The problem is, when is the pin straight infront of you. What if the pin is sitting in the back right of the green, and going right is short siding your self. You have your shot cone, you aim at the flag, but you happen to be slightly open, you hit the side of the green and it bounces into a bunker or into the water. You know you hit a push fade, you aim for the center of the green, you know if your slighly open you will end up nearer to the pin. If you hit your normal fade you end up 10-15 feet left of the pin, if you hit it straight you end up middle of the green.
this problem become much more troublesome with any sort of wind. You want to hit it straight, but you draw it with the wind, your going to end up way left and over the green. You end up fading into the wind on accident, you end up short of the green. What if you want to go for a pin location that is tight. You can't because with all the variables in the shot, you need to hit it one way or another, because hitting it with a left shot direction means certain death. Its better to always error on one side or the other, because its one less variable you have to play for.
I definitely see the logic of taking one variable out, however, I mostly just shoot for the centers of greens, as my accuracy is pretty poor right now.
I guess when I get better, I'll develop a consistent shot pattern and have the variable of right/left out of play. But until then, I just want to get to within 15 yards on either side of my target line!