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rozboonIt does help, somewhat. Some delamination is just from a crap batch of epoxy or poor spread in the layup resulting in a weak section, in which case warranty all day.
But thinking about the forces when you're sliding a rail, if your downhill edge catches even slightly then the edge is trying to flip your ski up on it's side whereas your weight is forcing the ski flat which will apply a significant twisting force to the edge, which can result in it pulling away from the layer above. Edges aren't really made to take a downward force.
If you detune the edge underfoot then there's less chance of this happening.