what I would like to know is who the heck came up with control wheel steering (CWS)? what a freaking waste!
In fact CWS mode is a useful fall-back if manual flying in severe turbulence since the extra control forces involved with CWS mode minimise the tendency for the pilot to over-control in pitch and roll which in turn could, in the worst case, result in an unusual attitude in IMC. To answer your erudite question, however, it was the manufacturer based upon decades of experience of designing jet transport aircraft.