HarryMan;
My sense of it is, the arm and hand "unit" has sufficient mass to be moved about on its own but that would be turbulence very much in the moderate to moderate + territory. Anything lighter than that would be controllable, but one must not grip the stick firmly but "ride it at the top" while making corrections. Unless the inertial reels fastening the shoulder harnesses are locked tight around the upper body, they won't prevent movement, especially sideways.
That's one view...there will be several thousand others. ;-)