I think we're all going to be somewhat unable to answer very well since we don't really know what your friend means but.... Personally, I've not heard the term "drum technique" but even within WC terminology changes. To me this is situational, for example you can use a fook sau or a jut sau to open the center but if the guy is built like a tree ( and IMHO you study MA to handle those people stronger than you - not weaker!) good luck. So if you can't move him ( or her ) it is you that should move! Again I would say this is situational but if you hold with the assertion that you are preparing to fight someone stronger than you then learning to move around your opponent isn't a bad idea even if the person you are currently practising against is weaker than you. Well I've certianly seen this idea in WC. I've seen people deal with a center-line punch with pak-sau, then fook sau, then punch when pak/punch would do (or even just a punch!). Traditionaism is a double-edged sword. It insures that you never fall backwards but also that you never move forward. If you read Rene Ritchie's book you'll see that there a least a dozen of branches of WC across China - they all have differences. How does any Sifu know his Sifu "got it right"? As another poster wisely said: It's important to change but only if necessary.