That's another good point - the amount of roll required to complete a horizontal hinging action depending on the flatness of the clubshaft's inclined plane.
My main point is that I cannot personally identify a necessary causal connection between a golfer's right wrist/hand position at the delivery position and his ability to selectively perform a horizontal versus an angled hinging action in the followthrough. I also don't think that it makes sense to debate whether the right wrist is level or upcocked at the delivery position if the golfer employs a late release action where the right wrist is maximally dorsiflexed at that late release time point.