The last part of your post is very true and something in going to take on board.I think both legs are important. The position of the back leg determines how much space you have between your body and the cue when you stroke. The relationship between your rear leg and front sets the alignment of your hips. Obviously, there are tons of varying theories on what is the correct way this should be done. Since there are so many varying body types, common sense dictates there isn't one perfect stance where one size fits all. Seems to me that a stance that provides a stable base while allowing the player to stroke straight without being constricted is a good one.
I like Stan's philosophy, that being, your visuals dictates the stance, not vice versa. It makes sense. Over the course of a game there are generally multiple shots that won't allow a "ņormal" stance. Finding the correct aim line with your eyes and letting your feet move to provide a stable base seems logical. Your feet can't see, your eyes find the aim line.
You cant always stand the same, but you always see the same.