The so-called CNC is bright with the machine tool, polishing is usually hand-throwed.
The machine tool car has high efficiency, but it can only be used in one plane. The side and the slope are not available. For example, the following figure.
The side of the spokes of the hub is not available in the car.
Polishing can be thrown to the side and bevel. As shown
Look at this window where the spokes are polished on the sides. The lathe is not in this position. Since it is hand-thrown, of course, the polishing cost is higher.
The second question, which is better to fix. In general, the polishing wheel is not covered with varnish, and all minor scratches can be thrown a little more. The car is usually covered with varnish, so I thought that the car was repaired and finally covered with varnish. The varnish is transparent.
Of course this must be a very slight scratch.