Because I recently moved to a cold northern climate, I'm keeping the hair at a #2 clipper for the winter.
What do my eyes see? Suddenly a lot of grey hair sprouting up.
I'd say this is not a disadvantage at all. Quite the opposite, in fact. Keep your noggin shaved and you won't see the grey (and neither will anyone else).
Look at it this way.... It'll be harder to see the shadow.