I would agree to a point. However, the only essential visual cues to cut the ball into the hole, are the CB & OB. The other things are secondary, which may, for some players, cause them to "believe" that some shots are more difficult than others (except in the case of extremes). Once you have an accurate & repeatable stroke, aiming comes pretty easily for most players. I've seen and worked with far more players who thought their aiming was off, but it turned out to be flaws in their strokes and/or visual perception. Fix the stroke and train the eyes, and aiming accurately comes with it. Then you have to experiment with speed and spin, to learn how they affect both the CB, the OB's, and what happens with collisions. :thumbup:
Scott Lee
http://poolknowledge.com