Bruce de-emphasized trapping, he taught very little of it to Ted Wong his last long term private student.Ted Wong wasn't at the Chinatown school that much and most lessons there were taught by Dan Inosanto, in private lessons Bruce Lee taught Ted Wong things he was currently working on so was not just sticking to the Chinatown syllabus taught at the school. Whilst Bruce taught him privately, he used him as a practice partner to spar with, do drills with, test things against that he was working on. Teri Tom has said she learned very little trapping from Ted Wong because he did not know it all and he showed wooden dummy and trapping more for historical purposes. In his final few years in Hong Kong Bruce de-emphasized trapping, as for discarding it for himself completely we'll never know, he did not keep such detailed notes then of what he was working on and training, even if he had discarded it and thought waste of time better to just hit then it still would have came out if the situation presented itself in a real confrontation after practicing it for many years before and using it in Enter The Dragon doesn't mean he hadn't disregarded or de-emphasized it in real life. Few if any possess Bruce Lee's speed and timing to land strikes everytime without the need to trap from someone blocking his strikes or getting an arm in the way.