No matter how much one practices, or how perfect their stroke becomes, their are shots that are simply hard to see the aim point. A system that puts a person with a solid stroke on these spots as long as they do it right would be of value to many people for at least these shots.
It you believe this to be true you need to practice those shots until you no longer have a problem making them consistently. Lets face the facts, some people will never play well for many reasons which I do not need to list here, we all see players that no matter how hard they try or how much they practice they just do not get it.
But, nothing substitutes for having strong fundamentals and an excellent stroke with out these aiming is of no consequence because no matter how clear and accurate your sight picture may be you will not be able to deliver the cue in a straight line to your perceived contact point on the object ball.
Most players are looking for quick fix to correct their problems and these systems will not help them unless they have a good stroke and good fundamentals. Practice is the key to being a good player and no system will change that, for those who are students of the game and have the ability to progress and learn time is the key factor. Each of us uses method's for aiming, some of us see things one way and others see things differently so there is no catch all system that will work for everyone, if you find something works for you use it and never stop.
Only time will tell how well anyone will play, and that is based solely upon each individuals habits, abilities, and how much time they spend learning the game.
JIMO