I couldn't tell you what to reject because I don't have the expertise to. If you read Tao of Jeet Kune Do like I said earlier, some of Bruce Lee's ynotes go into details about what and why he's adopting certain things from specific sports / martial arts whether it be fencing or boxing or wing chun.
Not only I do, but many people far more knowledgeable then you or I do too. Dana white president of UFC called him the father of MMA, sugar ray leonard (i know he's not MMA) called him one of the greatest fighters ever and both Frank Shamrock and Randy Couture to name a few MMA fighters consider him father of MMA.
He promoted a training philosophy that was aimed at being the most relevant to Street fights / brawls and not necessarily being easy to learn, he understood that fighting in martial arts / boxing etc tournaments wouldn't necessarily prepare you for no bars fight since there are rules in tournaments e.g. No groin hits, no eye jabs etc.
It was developed to be effective, not easy. And considering how renowned he is as a fighter, I'd say it works.
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