Sihing I'm not specifically talking just about wing chung all styles have gaps in there fighting. I'm just basing my argument on what I see from Wing chun practitioners at tourneys. Tournaments are not necesarally a represantation of wing chun on a whole, since I have also run across very good wing chun people. To be honest most of these guys also had various MA backrounds and in many cases used wing chung as a base for there fighting but also reverted to other fighting theory's.
Closing the gap is a very important issue that I feel the majority of win chun practitioners often avoid dealing with . I just think for most people it's a matter of preference. Even when it comes to styles like Bjiu jtsu wich is very effective tend to avoid the issue of stand up some guys do well closing the gap others just get knocked out while they try to close the gap by shooting in.
Most of us get too comfortable in the theory or range of our prospective style.
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