Why shave an area devoid of hair?

Or, do you mean that you cannot avoid the hairless areas when shaving the hairy areas?
I had to shave my whole face throughout 15 months of laser, simply because the laser gradually decreased hair density fairly evenly across my face. Shaving with a Braun 8000 never seemed to irritate my skin.
I never use aftershave. Instead, once I finish shaving, I rinse with cold water, pat dry, and lightly apply a good facial moisturizer like Laura Mercier or La Prairie Cellular Time Release.