Earlier quoted context omitted.
Most method books will touch on a wide variety of genres, usually to illustrate specific topics in music theory. If you can’t reason about intervals/scales, key, and chord progressions, “learning” genres like jazz will be like trying to learn differential calculus before linear algebra.
Calculus in practice involves a lot of symbol manipulation, so it's important to understand the symbols. Jazz in practice involves a lot of playing an instrument, so it's important to understand… Fill in the blank. I don't know about you, but I don't fill it in with “music theory”.
That's because you aren't a jazz musician. Jazz features lots of complex harmonies, and theory is a big part of writing and playing it. Certain subgenres are virtually impossible to perform without a solid theory foundation. You think you can just solo over Giant Steps by feel?