[Story Time]

...rhetoric in the colloquial sense of artful words used to mystify / confuse others. The myth word did come first.

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...I'll try to keep this simple. "If a person told me that their system would be enough to suit all of my self-defense needs, I'd probably avoid learning from that person."

Why? Because at the end of the year, a person's body type lends them to a particular teacher. When a student possesses a physique like their teacher's that student will benefit from directly applicable knowledge. This knowledge can also take the form of highly personalized advice. The kind of help that comes from an instructor whose quest was tinted with the type of physique which their student lives in.