Drivers only learn by making and correcting their mistakes. Higher speeds require quicker reflexes and observational skills. This makes the transition to a different environment the only requirement. Drivers are taught that all skids begin with a slide. If sensed early enough and properly handled, you can prevent a slide from developing into a skid.
Slides are controllable.
We train drivers to judge a vehicle's traction limits on any surface. It shows what happens when they attempt to do the same thing with Hand over Hand Steering. It very quickly becomes obvious that Hand over Hand does not and can not work. This is the main reason that so many drivers loose control on the highway. They simply let go of the steering wheel because they do not know what else to do and this ultimately results in loss of control.