But isn't one huge issue here also that the way the airbus flight controls are designed it made it very hard for the experienced pilots to realize the wrong inp

But isn't one huge issue here also that the way the airbus flight controls are designed it made it very hard for the experienced pilots to realize the wrong inputs the 'unskilled' pilot made and essentially allowed him to silently control the plane? This seems to heavily undermine the whole purpose of having senior people on board. And to rely solely on verbal communication to coordinate the input controls seems a very fragile concept to me.