Barracuda rear shackle question

If I had to guess why factory would install a hanger made like that... road quality. All the high mileage well worn spring bushings I have seen were worn laterally/sideways meaning the left to right stress made more wear than straight rotational/up down stress. if the roads are extremely rough the sideways stresses would really take a toll on the 2 bolts where the clip bolts to the car. The wider hanger would absorb a lot more lateral stress.