This is the problem when people only look MA from his own MA style point of view. - WC guys fight against WC guys. - TKD guys fight against TKD guys. - Wrestlers fight against wrestlers. - Judo guys fight against Judo guys. - ... The chance that you will have to fight against someone from your own school is very small. When we discuss grabbing, Taiji guys may say that they don't grab. Since their opponent may grab on them, they still have to train how to deal with it. The problem is if your teacher only has trained one MA system, how will he be able to teach you dealing with other MA systems?