Machine versus hand: what each tool can and cannot do
The machine is only a third of the system. Pads range from aggressive microfibre and firm foam cutting pads down to soft finishing foam, and compounds run the same spectrum from heavy cut to ultra-fine finishing polish. A skilled operator matches pad, compound, machine speed and arm pressure to your specific clear coat — Japanese paints tend to be soft and mark easily, many German paints are hard and need more cut. That matching is the actual craft you are paying for.
Hand polishing has a role, but a narrow one: working a small etch mark, applying glaze, or finishing spots a machine cannot safely reach around door handles and mirror caps. What it cannot do is genuine correction across a whole car — human arms cannot sustain the consistent pressure needed to level clear coat evenly. A 'full hand polish' at machine-polish money is really a wax-and-fill job, fine only if described and priced as one.