I think the misconception is that chi sao is a fighting technique, but its not its an excercise and the compound trapping drills are excercises also meant to enhance sensitivity and hand flow and reaction, and the claim that that range does not exist is a myth because that is the great thing about trapping you can do it passively or offensively so if the range is not there you can make it there by pressing the fight, trapping does work its difficult but the rewards are well worth it man.