Prolonged repetitious drillings will certainly yield mechanical precision and security of that kind comes from any routine. However, it is exactly this kind of "selective" security or "crutch" which limits or blocks the total growth of a martial artist. In fact, quite a few practitioners develop such a liking for and dependence on their "crutch" that they can no longer walk without it. Thus, any one special technique, however cleverly designed is actually a hindrance.
TKDTutor Comments: Hindrance to what? Jeet Kune Do has its own techniques, why are they not also hindrances. If individual techniques are bad for other styles, then they should also be bad for JKD. If you do not know how to perform an effective side kick, how will you be able to perform the kick when an opening that is best attacked with a side kick presents itself.
Let it be understood once and for all that I have NOT invented a new style, composite, or modification. I have in no way set Jeet Kune Do within a distinct form governed by laws that distinguish it from "this" style or "that" method. On the contrary, I hope to free my comrades from bondage to styles, patterns, and doctrines.
TKDTutor Comments: If one says he has no religious beliefs, the statement itself is a religious belief. The person is saying he his religious belief is that he does not believe in religion. Lee says JKD is not a style, but then he teaches it in a particular way according to his philosophy, which makes it style. Just saying that JKD is not a style does not make it so.