Not saying Bruce Lee was wrong on all points, but he was a kid when he wrote that. Put him in perspective. How much weight would we give to the "insights" of some twenty year old kid today that started practicing Wing Chun a few years ago, regarding the state of all martial arts?

He was fantastically talented and dedicated to training, but beyond Ip Man he had relatively little experience with traditional martial arts. Everything he said needs to be understood through the filter of his age and experience. It's a young man processing his own martial arts journey and expressing his opinions.