Again, you're talking steep climbs, not all climbs. Not the primary terrain, but yes, an important one. And riders will move back on climbs when on technical terrain. Fitting a neutral position for maneuverability, power production and balance is more important that optimizing for one specific part of the race.
We'll agree to disagree. There are different ways to skin the cat, but I'll stand by my statements and belief. It's the belief of most major fit schools including Retul, the one I follow primarily.

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Brian Grasky
Grasky Endurance: World Championship Triathlon Coaching; Professional Training Camps
RETUL fitter, Biomechanist, USAT Level 3 Coach, USAC Level 2 Coach