Xinglu
Black Belt
And, that's the biggest problem with the people who's concerned with style vs style. Just in China alone, there are 100s if not 1000's of different styles. How do one even begin to learn all the possible methods? How do we enter the minds of our opponents? How do you know all your potential enemies?
Learn to close your door, my friend.
I'm concerned that this can lead to a slippery slope eventually leading to, "it is pointless to train with people who practice other arts." Your gongfu can only increase, by continually testing and developing. This can only happen so much by training only with other practitioners of your own art. If I'm not mistaken, Yongchun means "eternal spring." Which implies that it is always growing. How is that growth going to happen without testing your strategies and tactics against those who are not familiar with them (and you are not familiar with theirs). That is a true measure as to how much you are "growing" and in what areas you still need to grow.
It is not about learning every possible defense, it is about experience. And the best way to experience your own art IS to pressure test it against something unfamiliar.
Furthermore, going with the door analogy: a shut and locked door will only keep an honest man honest. Security is an illusion, nothing more then a pacifier.