I know this. Stan explained it on YouTube. He said exactly what you said, that a player would just know. What I am saying is that a play won't just know unless he has the experience of knowing. I mean, you get your perception, then you automatically know it's going to miss the pocket by an inch or two, so therefore you know which way to pivot or sweep. I believe a lot of aspiring players can't just look at the balls and tell if the shot is a little thin or not....that's why they are turning to an aiming system in the first place. You guys assume every player can just see that it's thick or thin, ignoring the fact that you can do it because you have the experience needed to do it.
Except, for the vast majority of shots, it is not just an inch or two. It will be obvious to anyone that has played a little.
As far as rank beginners, they shouldn't be messing with any aiming system until they learn how to stroke the cue fairly straight anyways. No aiming system is going fix a poor cue delivery, but most will showcase a poor cue delivery.
And, any system that puts one of the correct shot line will be doomed to failure by a stroke that can't deliver the cue down that line.