Boxers - Black Rockers?

A previous post got me thinking about Boxers with the black Boxer trim delete option that many of us have on our cars. My car has black rockers with a mild wrinkle finish, however, and so I checked out other pics of cars to see if they were the same. Best I can tell from a sample of about 10 cars, about half have the black and the others are body colored. It is hard to see in pics given the shadows and angle of the rocker panel itself. Does anyone know if this is how they came, or was it a subsequent change to keep maintenance down? Further, what is the texture of the painted surface there supposed to be?