Thread title is a bit over the top but hope it got Geezers attention! 
Chi Sao is meant to train skills that you then need to learn to apply in sparring It is not meant to be a replacement for sparring or an end in itself unless. However most Chi Sao has devolved into a situation where hitting someone and superiority of Chi Sao skills is the goal. Chi sao is used in a competitive way which actually destroys the skills the exercise is trying to train. This has led to most being unable to actually applying WC skills in sparring or fighting situations with non cooperative opponents.
One example is attacking on the change. This is teaching nothing other than taking advantage of a roll and boosting the ego of the successful attacker unless you believe when you get into a fight the other person is going to put up his arms and say Chi Sao time!
Another thing is Chi Sao tag where one person is hit and then the other reaches a to get a hit of their own and feels vindicated when they tough someone at arms length.
In that video Leung Ting has put up his son,or so I was told as a victim to prove how good his chi sao is against all comers. The result is total stiffness, reaching to attack, no discernible footwork ,no balance,no use of hips and no actual skills that would translate into real fighting success. All the time they spent doing chi sao and this is what happens when faced with a non cooperative partner.
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This even happens to WC teachers held in high regard at about 1:33 Gary starts chi sao demo with a stranger that hasn't bought into the teacher is great self Hypnosis that is the usual standard. First roll he notices the bad,lazy tan Sao of GL and the second roll he lands what would have been a powerful strike taking advantage of the bad tan sao. I am sure GL was being lazy because no one ever took advantage of this position before.
The result Gl totally lost his stance then starts to attack on contact instead of rolling when they make contact again. Taking advantage of the person who's is clearly showing his intent is to roll not fight. Gl continues reaching strikes trying to get back a hit and look at his total lack of footwork when chasing .Look at the just walking forward at the 2:30 mark.. What is the point of training chi sao if one little hit is all it takes to forget all the wing chun you have learned over 50 years?
Video 3 to show this problem is not just a Yip Man issue.
Yiu Choi wing chun from Foshan and what do we see nothing but powerless reaching strikes, arm stiffness,shoulder stiffness. Chi sao tag and nothing more. Can't see the footwork so no comment on that.
You should not play tag when doing Chi Sao. When you are hit with a strike delivered while the elbow is bent you should stop1. It is over go back and learn what you did wrong and try to fix the problem. You learn from getting hit. If you opponent stops don't take advantage and reach to hit him trying to get even.That will not happen in a fight people won't stop when they hit you and slapping someone will do nothing to slow them down.
Chi Sao can be the most important drill you do because it can teach you to function in the more dangerous fighting range learn the skills and do not think it shows you have any real fighting skills. Chi Sao skills prove nothing when it comes to fighting ability only sparring with non wing chun people can develop those skills

Chi Sao is meant to train skills that you then need to learn to apply in sparring It is not meant to be a replacement for sparring or an end in itself unless. However most Chi Sao has devolved into a situation where hitting someone and superiority of Chi Sao skills is the goal. Chi sao is used in a competitive way which actually destroys the skills the exercise is trying to train. This has led to most being unable to actually applying WC skills in sparring or fighting situations with non cooperative opponents.
One example is attacking on the change. This is teaching nothing other than taking advantage of a roll and boosting the ego of the successful attacker unless you believe when you get into a fight the other person is going to put up his arms and say Chi Sao time!
Another thing is Chi Sao tag where one person is hit and then the other reaches a to get a hit of their own and feels vindicated when they tough someone at arms length.
In that video Leung Ting has put up his son,or so I was told as a victim to prove how good his chi sao is against all comers. The result is total stiffness, reaching to attack, no discernible footwork ,no balance,no use of hips and no actual skills that would translate into real fighting success. All the time they spent doing chi sao and this is what happens when faced with a non cooperative partner.
next
This even happens to WC teachers held in high regard at about 1:33 Gary starts chi sao demo with a stranger that hasn't bought into the teacher is great self Hypnosis that is the usual standard. First roll he notices the bad,lazy tan Sao of GL and the second roll he lands what would have been a powerful strike taking advantage of the bad tan sao. I am sure GL was being lazy because no one ever took advantage of this position before.
The result Gl totally lost his stance then starts to attack on contact instead of rolling when they make contact again. Taking advantage of the person who's is clearly showing his intent is to roll not fight. Gl continues reaching strikes trying to get back a hit and look at his total lack of footwork when chasing .Look at the just walking forward at the 2:30 mark.. What is the point of training chi sao if one little hit is all it takes to forget all the wing chun you have learned over 50 years?
Video 3 to show this problem is not just a Yip Man issue.
Yiu Choi wing chun from Foshan and what do we see nothing but powerless reaching strikes, arm stiffness,shoulder stiffness. Chi sao tag and nothing more. Can't see the footwork so no comment on that.
You should not play tag when doing Chi Sao. When you are hit with a strike delivered while the elbow is bent you should stop1. It is over go back and learn what you did wrong and try to fix the problem. You learn from getting hit. If you opponent stops don't take advantage and reach to hit him trying to get even.That will not happen in a fight people won't stop when they hit you and slapping someone will do nothing to slow them down.
Chi Sao can be the most important drill you do because it can teach you to function in the more dangerous fighting range learn the skills and do not think it shows you have any real fighting skills. Chi Sao skills prove nothing when it comes to fighting ability only sparring with non wing chun people can develop those skills