I don't even know what questions to ask; but I have been studying jazz a while now and I never heard anyone say 2-5 was obsolete. As a matter of fact almost everyone agrees you simply can't play jazz without tons of 2-5's with or without resolutions -- maybe just lots of 2-5's strung together. So, I'm interested in this revolutionary new way of thinking for guitarists; but I would like a little more info before I buy this book and stop pursuing mountains of other jazz methods available.
I understand you concerns and I agree with you : II-V (and their resolutions) are an essential part of jazz harmony. The point I was trying to make in the book review is : many jazz guitarists/pianists simply comp "by shape" without exploring the full harmonic potential of tunes and progressions.
Here are some resources on my website to better understand Barry Harris Harmonic Method for guitar :
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