I missed your question in the quick scan i made when returned from a long trip. Indeed is an interesting point.
D : suppresses first class information to a PNF
Why not a coupling (FBW means) between sticks. This could also be retrofitted quite "easily". (Not interferes with other "features")
Cost seems not to be relevant. The sensors (position) on Stick or Yoke are similar. The mechanics of the Yoke, IMHO not too much more compared to Sticks. I really suspect the decision was
marketing oriented. And in a serious survey (among pilots) would not be implemented, technically speaking. Something probably happened biasing to a "novelty". We will learn more on that.