The contact element within Chi Sau is purely so two people can exchange force which in turn improves strength, structure, balance and punching precision amongst other things.
Lat Sau Jik Chung exercises are used to correct natural errors and to train the Ving Tsun straight punch. Such errors include bringing the arm backwards before a strike is delivered and chasing the opponents arms rather than go straight to the target.
The punch in itself serves two purposes. To attack and defend simultaneously.
In a proper fight there is no contact with arms albeit a split second in order to clear a path for the straight punch.
Unfortunately many systems have *******ized this drill and turned it into a game of pressing and manipulating each other force and intent etc etc etc
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There is no time in fighting for such things to occur. Looking for arm contact, making a bridge and controlling arms is nonsense! Using blindfolds and trying to detect things through arm contact is also nonsense. Chi Sau serves a purpose so that we can punch, recycle the punch, find and use striking opportunities and deliver strikes with precision and balance through both attacking limbs. LSJC is from the whole body unit
Arm glue Wing Chun is pointless and only works when two people are living up in the clouds.
Blindfolded chi sau can highlight the fact of how many striking opportunites are lost through the mish mash of two people attacking each other. If you want to "feel" your opponent give him a cuddle. It will be more effective