The weight of a relaxed forearm will cause it to fall down and away from the fretboard. Even more so when the upper arm is also raised (as with the neck up approach) (I keep my elbow tucked into my side and nearly perpendicular to the floor).
I guess one could say that the amount pinch force of the hand (between the thumb and fingers) that is required to keep the weight of a relaxed arm from pulling the hand off the neck is about the force that is needed to fret a barre cleanly and thus that acts as some sort of fretting pressure guide. Even if that is plausible (not likely) you still have the neck being torqued downward. I avoid that.
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Derek Coombs
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Guitars by Mark Blanchard, Albert&Mueller, Paul Woolson, Collings, Composite Acoustics, and Derek Coombs
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