I have read posts where people have said, that the PC wasn't designed to be used the way Kevin describes. I find those comments to be very far from the truth. It was my understanding that orbitals were originally designed for the purpose of sanding. When you use the PC as KB describes, you aren't polishing, you are sanding. When your thoroughly cover the surface of a pad with a uniform, non diminishing abrasive, you are essentially turning it into a sheet of sandpaper (the abrasives don't diminish, just like the abraisives on a piece of sand paper). The lubricants in the polish (along with the non diminishing abrasives) serve the same purpose as water does when wetsanding.
To me, you can't make a PC act any more like it was originally intended for than you do by using the KB method.