I would think that the remaining knobs may be more prone to shearing off. Stock, the forces on a hard surface like a rock would be limited by adhesion and distributed across several knobs. Modified, you now have more side knob contact, and potentially more force transmitted through the knobs. Being the knobs/compound is very soft and not designed to be loaded in this manner, it could be a weak point. Eric has been doing this so I guess he knows for sure. I will try it with a used tire and see how it holds up in the rocks.
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