As a photographer I'm not without control here even if the client is going to print on their own. I view it as part of my responsibility to know how the images will be printed.
If I know that they will be printed by a minilab I know that I need to avoid using techniques that require some thought or judgment on the labs part. Shoot snap-shot style if you will.
If it's commercial work, I need to shoot to the specs their lab expects.
I can still provide value and show my style, I just have a narrow range to do it in because I can't fix the mistakes I make in the camera at printing time.