When driving a stick shift, you'll frequently need to shift gears while either accelerating or braking, meaning your left foot must always be free to operate th

When driving a stick shift, you'll frequently need to shift gears while either accelerating or braking, meaning your left foot must always be free to operate the clutch while the right foot is either on the throttle or the brakes. If you get into the habit of braking with your left foot while driving an automatic, you'll have real problems whenever the need arises to drive a manual. I think that's a much better reason.