I'm not a real fan of the CnC look. However! there is places, that texture will help pull liquid fuel running down the port walls, back into suspension.
I wouldn't touch the seat/bowl/throat area, as a clean up idea. It will more then likely not help. A flow bench may show a gain, but will not be seen in performance.
I have no experience with these heads, but a texture that you can catch you finder on, is a good thing, under the intake valve.
