I wouldn't particularly like to call any Taekwondo 'traditional', nothing to do with it's history, more to do with the fact that it is a martial art based on modern scientific principles. Theory of power generation comes from body mechanics in place of something like Ki/Qi/Chi. Also, it should evolve around what is proven to work, that's why the KKW change things, it's why you have some people in the ITF trying to change things, to fit in with modern knowledge of what works and what doesn't, how to train and fight for longevity, not training to a point where you reach 40 years old and your news are gone and you can't make a fist through arthritis. To me, the true essence of Taekwondo, regardless of organisation, is evolution.