in an attempt to actually address the topic...
A boxer's stance is wider and shallower than a WCK stance, as it needs to be to throw its techniques. But, you are only as rigid, or as flexible as your mind allows you to be.
Your WCK stance-any stance is two points on a straight line. If you change your orientation, you change the stance-without changing the stance.
ex: Say you are standing with your feet at 12:00 and 6:00. If you turn your head to 1:00, it is the equivilent of changing your feet to 11:00 and 5:00.
Or, if you were on a rotating platform, as it turns, and you maintian your head facing 12:00, the position of your feet change respectively.
Shifting stances contains all the angles and permutations within, when shifting from A to B, just as going from Bow stance to Bow stance, you pass through the horse and everything in between.
Taking your flexibility of mind a step further, your footwork needs to be active.
Working your footwork until rapid changes in angle and distance is achieved naturally and smoothly and effortlessly takes an investment in time.
This does not mean bouncing, around, or a boxer's shuffle, but finding your place, while maintaining WCK principles and concepts while being flexible.
"I don't break the law, but I have bent it considerably, at times!"
"My Gung-Fu may not be Your Gung-Fu.
Gwok-Si, Gwok-Faht"
"I will not be part of the generation
that killed Kung-Fu."
....step.