My guess is two things: 1. All snow has some level of particulates, especially older snow (moreso if there has been melting, because the particles/dirt/whateve

My guess is two things: 1. All snow has some level of particulates, especially older snow (moreso if there has been melting, because the particles/dirt/whatever concentrate on top). 2. Cornering on piste would put pretty big stresses on the tip of the edge. This could perhaps cause the edge to bend and curl, or even break little pieces off from metal fatigue. I think this would be a bigger deal in most winter skiing conditions.