Most people would know the feel of the plastic of stickerless cubes are smooth and better than a stickered cube. You can die it black and put stickers, but this is very tedious and and extremely inconvienent. Now many people may argue that you can see the color of a particular piece when its turned 45 degrees. In my opinion, this doesn't actually help you that much, and most people honestly don't use that advantage even when they solve a stickerless cube at home. Plus, even if they did, if everyone could use these kinds of puzzles, what difference would it make. Anybody has access to buy these cubes, and many people own them.  It will literally take 0.01 seconds to slightly rotate the cube to see the color of the piece. Since stickerless cubes sometimes can feel and turn a lot better then why not allow them? Let's make a change and have stickerless cubes in competitions!!!!