The riding position is not identical if you change the height and set back of the saddle. Seems like you would want to keep those constant if they were set correctly initially.
Originally Posted by
Clem von Jones
In both animated gifs the riding position is identical yet pivoted forward or backward relative to the center of the bottom bracket. Notice that as the handlebar comes up the stem has to be shorter, the rider is shifted backwards, the saddle moves back and down, and there's a hell of a lot more weight on the rear wheel.