Well, let's think for a moment. Are we concerned with the intermediate results, or the final results? If the total amount of paint removed is the same, but the rotary does it in 20 minutes and the PC does it in 3 hours, so what if you stop and look 1 hour into the PC job and the paint is dulled? You've only removed some of the total amount of paint that you would've removed with the rotary anyhow, and now you're going to smooth it out and shine it up, and the total amount of paint removed is the same, and the car looks like glass. Sounds good to me.
I don't see that as moving backward, unless you stopped after using the cutting pad & PC. When the rotary leaves holographs, you don't stop there, either.
Tom