Roy I think it is because the cut is usually very clean with straight edges and also very fine not mention that it is usually at an angle so the skin doesn't keep pulling apart. I guess that we also keep it fairly sterile during the healing process.
I just thought also that seeing as we effectively exfoliate the area daily it might prevent scar tissue from building up.
I am not sure how the guys go who remove chunks of skin though.
However back to the OP I can't see a little cut like that scarring and even if it does it won't exactly be major.