I think maybe the picture is not doing the damage justice.
well all I can do is talk .. can't do a thing from here ,
( but question the wisdom of fixies with out brakes ) I acknowledge the Trendiness , these days..
if you had a dial micrometer you could give the depth . those scratches, an exact number to the 4th decimal point..
So you're proposing that I should tell my son that the money he saved mowing lawns just earned him an opportunity to spend some quality time with an emery cloth?
.. then You do it.. I cannot.