You may be right, but is it also not easier to bring a carbine like the M-4 to shot via a front grip in a closed (urban) environment? Your front hand leads the movement as opposed to your shoulder.
That grip also makes it easier to carry the myriad of accessories nowadays seemingly tapped to the front of a combat rifle (Torch and IR markers etc) - that seriously distort the centre-of-gravity of your weapon.
your body is the turret, you don't lead with your support hand.....you move with the upper body.
The VFG is just for better control in a CQB enviroment and better control for rapid firing. also the egronomics of the human body are more suitable for the VFG. try to get into a fighting stance, and see how your fist are aligned with your body, you get the idea.
the VFG has some down side, you can't shoot over a wall or the hood of a car with out risking too much exposure because of the VFG getting in the way... you can go into a junkyard prone to solve that drawback...
the VFG also have snag on gear factor.... you have to be more careful.
I for one use the VFG and love it.