Most dealerships and high volume shops have the workers running rotary buffers with wool pads and they never follow through with all the required refinement steps, resulting in holograms everywhere.
Example...(extreme)
This car was painted and wet sanded 6 months ago. The right side of the hood is how it looked after the body shop compounded out the wet sanding marks....full of nasty holograms!
The paint has since shrunk down a little and still had a little more orange peel than the owner wanted. This weekend I re-sanded the left side of the hood and compounded out the sanding marks my way...
One more polishing step and the paint was like glass!