Either way, either it's a gift or it's developed. But not everyone can develop it. Just not possible. So, what should those folks do that never see the line, ever ?
Should they quit ? And if you want to call it crutches, that is fine. But nobody is complaining that is using the crutches. Shouldn't they be the ones pissed about getting "robbed" by all the devilish hucksters with aiming systems?
If I can teach a 50 year old woman with a decade of pool playing experience in 30 minutes how to finally pot balls. It appears that she was never gonna see the line the way she was going.
Maybe she does now, because by making balls more consistently now, she might actually develop a "sense" or see the "line" that was not there before. How is that a bad thing?
If you're going to use a crutch, whether ghost ball or one of the more esoteric ones, you're going to have to do a lot of visualization to deploy them. Why not concentrate on the line rather than all the rest?
And yes, of course there are people like the woman you used as an example who have played for many years. But years playing is not a valid criteria in and of itself. I think you also have to measure what a player's aspirations are and whether they're putting in the road work to achieve them. You taught the woman how to make balls with more success than she was previously enjoying but equally that's just relative and I doubt she's much of a threat to a serious player. Or are you saying that now she's the next Jeanette Lee?
Lou Figueroa