I'm not big on aiming systems for actual "aiming", such as cut the ball x percentage to make this cut shot. I think that is second nature, almost immediately, and including with all spins.
However, one component of "some" aiming systems, is the precise place where your eyes focus on. I do believe if you look at the wrong place, your eyes will steer your stroke crooked, no matter if its 1000% perfectly straight otherwise. This is Geno Machino's main principle in his Perfect Aim system.
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