I can't trust you on this one because what you say is utter nonsense. A cut shot that you wouldn't even consider trying? So it's just totally unfamiliar? You're kidding right? Who are these pool players? Did they just pick up a stick for the first time? I understand where you're headed with this though. Being a card carrying member of the CTE evangelical mafia and all but the logic you're trying to use to get there is just plain silly. Just say what you mean, fractional aiming has been rendered obsolete by CTE and you can prove it! Well not really but you do believe it.
What?
So what's the time reference on having tried/practiced all possible shots? You apparently have a number in mind so go ahead and tell us what it is.
So if someone goes from not playing ever to having five years of play under their belt as an amateur player with a job should they have tried/practiced every possible shot by then and be an expert in it?
The FACT is that with an aiming system (and guessing is not a system) that you can approach ANY shot and use the system to aim it and then if your execution is good you can make it.
This applies to APA 2 speeds on up.
I have seen in in action when I taught aiming to helpless APA3s and 4s and watched them pocket balls that they had ZERO CLUE how to pocket before learning the system. My replies aren't only based on my own personal playing experience. They are based on informal experiments done with people who were of a much lower skill level than myself when they first learned the system.
If you took these same players pre-system and set up a bunch of "hard" shots they would butcher them in every direction. Teach them a good aiming system and suddenly - INSTANTLY - they were either making the shots or missing by very small margins.
Now, you can pooh pooh that all day but it's the straight facts. The ONLY variable in this situation is knowledge of the system. Once taught the pocketing percentages went up not only for shots they already were comfortable with but for shots that they were completely clueless about prior to learning the system.
And I am comfortable enough with that to be willing to BET HIGH on the repeat-ability of the results with other subjects.