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The fact is that it doesn't actually give any advantage to the solver other than the cube itself "feels" better, or recognition is better because of the sold colour on the tileside. It makes it alot easier to discern pieces at a faster rate. I have tried and failed to even utilise the advantage of the 45 degree turn at a slow pace, its not that informative anyway. A cube rotation is probably quicker for most people anyway, and people at the top level can already predict pieces based on the position of others that they CAN see without having this. It literally serves no purpose. I don't care about using the cubes in competition, but I feel that there should be no reason that they couldn't be. Ask yourselves honestly, would you feel as though you were at a genuine unfair advantage if somebody used a stickerless cube in competition against you?