Now, a feedback of the stick position of the other pilot would serve a purpose.
But isn't that what people are saying with backdriven controls?
If you treat the autopilot as a third pilot in the flight deck, then surely you'd like to see what it's commanding alongside what the instruments are saying. I agree, it's pointless having the FBW feedback through the sidestick.
On an airbus that would only show the control input, but not the control surface deflection as those are not the same
Many conventional aircraft over the years have had low and high speed ailerons, with the change-over happening automatically and no indication in the flight deck. The control wheel still moves as normal though
And surely what you say is exactly what the set up is on the 777/787.