I shaved when I was messing. I was on my bike all day everyday so collecting alot of crap, dirt, pollution on my legs.
If I slid out/crashed, if I was shaved, hairs covered in road filth weren't being ground into the wound and it heal sooo much faster, and it hurt less and was easier to clean and bandage. I commute now, and won;t consider shaving ...I'm simply not in the saddle enough.