For what it is worth here are my thoughts on stall stick position.
It is good for a very basic way of thinking, but it really doesn’t work as a one stop rule for an aircraft as IT WILL CHANGE in every aircraft under different situations.
It will only work for one single configuration as soon as you change things such as weight or C.G so will the stall stick position. Once you put flaps down or up this will also change stall stick position. Now if you where to put the undercarriage down on a low wing aircraft with the undercarriage in the wings you have changed the shape of the wing and therefore the stall stick position.
Also side slipping or skidding changes the way that the air will flow over the wing and therefore this will also affect the stall stick position.
I believe that it is silly to whole say that the stall stick position will always be the same. It is a very bold statement in my opinion.
