You haven't explained how disks brakes are better at getting to the margin of skidding than drum brakes. Granted, if the L & R brakes aren't matched, one will skid first, plus you will feel the car pulling to one side. People say that is more common with drum brakes, but I have never felt it. I am sure if they are poorly maintained that could be true, like grease on the shoes or the fwd & aft shoes are mixed up.