DW
Given that we've had at least one similar incident where having an interconnected yoke made no difference whatsoever to the outcome (Birgenair), surely you must therefore consider that the theory which supports your personal preference may not necessarily be the solution in all cases?
Birgenair was different, because the lower ranked FO knew what was happening, and was emotionally powerless to correct the Capt. . The FO could have overpowered Capt. by pushing harder on the yoke. Could he have done that with a joystick?
As for your argument that the 777 backdrive can fail: it's built to the same safety standards as the Cat IIIc autoland, i.e., 10 -(7?) probability of undetected failure.