John:
You are separating the "perception of the shot line" part from the fundamentals. Fundamentals aren't purely the "body parts are supposed to look and be positioned this way" physical notion. This is a common mistake from someone never trained in proper fundamentals -- it's EASY to assume that fundamentals are "purely physical."
Fact is, alignment is part and parcel of proper fundamentals. Fundamentals include the placement of the body for the proper perception of the shotline before you even get down into a stance. Perception has been taught for decades in snooker, and for many years in structured pool instruction as well (e.g. SPF). There's no use in even getting down into your stance unless you are in the proper position at the table to perceive the shot line correctly. Don't you think that basic tenet would be taught on day one?
-Sean
Again I will respectfully disagree. On YouTube I have found many videos discussing aiming and perception. Some of them point out that a person can step into the wrong "line of aim" as they call it. Thus a person can have an otherwise proper stance and delivery but not be perceiving the line of aim correctly.
What we THINK we see and what actually is are often two different things. Obvious examples include known optical illusions.
http://www.echalk.co.uk/amusements/OpticalIllusions/illusions.html
Once upon a time you said that you see the ghost ball as a fully formed sphere in the exact size sitting next to the actual object ball. I think you would agree that not very many people possess that ability to perceive or imagine a ghost ball in that level of detail.
I certainly don't.
Most people could not accurately draw a line an inch long. In fact modern forensic and cognitive science has repeatedly shown the fallible nature of eyewitness accounts of events.
What the eyes feed to the brain and the brain's subsequent reaction to direct the muscles is very much fluid and dependent on biological and neurological cues and interpretations. All this to say that what we see and perceive is not always what really is.
All it takes to miss a shot is the barest of error in the hit. Being just a teeny fraction off at the back of the cue ball where the tip is going to strike can result in a miss, either a small miss where the object ball rattles or a big miss where the object ball heads far away from the intended pocket.
What would you imagine would be the body and head position difference between a player who is able to go down to the perfect shot line and a player who goes down on the wrong shot line facing the cue ball? Let's say that the wrong shot line would send the object ball a half diamond away from the pocket, so a big miss.
Would you think that facing the cue ball with the object ball in sight that the difference would be an inch? Lets say that the big toe being on the perfect shot line is the measuring point, before the player goes down to the perfect shot line the big toe is and remains on the shot line.
So that means that the big toe of the player who will miss is not on the shot line while standing and not after getting down.
How much difference in those two body positions prior to getting down do you think is there?
I think it is very slight. I postulate that it's less than one inch. What does that one inch in body position mean to how the cue ball is addressed?
If so then that would be a difference of a human body standing up and looking at stationary objects with a one inch difference in perspective about to bend down to place the cue tip pointing at the cue ball of less than 1/16th of an inch or less than a few millimeters in my opinion.
That tiny difference makes all the difference if what I think is true.
This is what it means at the back of the cue ball. Perfect center in black.
I--------------------o--------------------I
Half a diamond miss in red.
I-------------------
o---------------------I
Looking at a smooth sphere without the helpful dashes.