If you did, your body would swing out off of the cliff like a door swinging open, your left hand and foot acting as a huge hinge. The problem is that your center of mass wants to reach the lowest possible point it can. Swinging out to hang from the remaining foot and hand achieves just this. I've tried super-gluing my chest to the cliff, and as shown in the adds you see on TV, it will hold. The problem with this method is that it tends to impede upward progress.
Some people like to dyno or deadpoint from such a stance.
The inherent problems are wasted energy, and the fact that you are relinquishing control of the holds. Maybe the foot work needs to change. Try putting more weight on the right foot and pulling the hold in with it. Think of when your dog tries to play tough and bark and scratch, throwing up tufts of dirt behind him by digging in his feet and pushing back. Now, YOU do that to the hold.