Why do I need to take gradings when some schools don have them?
Generally students who do Tai Chi are not looking to use techniques to punch or kick someone, so regulating the Art goes against the very idea of Tai Chi. Kung Fu / Karate students often want to be gauged for progress, and in Japan the system is you are either a white or a black belt for Karate, nothing inbetween. In China, few schools have a belt/sash system but for those that do, you earn those promotions.
Generally students who do Tai Chi are not looking to use techniques to punch or kick someone, so regulating the Art goes against the very idea of Tai Chi. Kung Fu / Karate / Jeet Kune Do students often want to be gauged for progress, and in Japan the system is you are either a white or a black belt for Karate, nothing inbetween. In China, few schools have a belt/sash system but for those that do, you earn those promotions.