I actually asked him about this at a seminar once, and he pointed out all
the "avoid notes" in the harmonic minor version, drawing laughs from the
audience. I though he was a bit condescending about it, but I got over
it. He stresses how much prettier the iim7b5 chord is with a natural
ninth, though I think he exaggerates this.
On a tune like "Morning of the Carnaval", noodling over the changes using
the harmonic minor
seems utterly appropriate, and is easier for a beginner than shifting
gears to a different melodic minor "key" on each chord.
Any comments?
Richard