it just doesnt matter and is personal preference. people here are trying too hard to make pool a simple formula so they can either get better quicker, or think whatever they are doing is perfect.
the effect it is wrong for them to change things that feel natural.
take pro baseball players. they all have a different stance, swing ,and way they look at the ball coming at them at 90 miles per hour.
why don't they standardize it like the pool players are trying to do. its because they use their natural feel and talent to hit the ball.