You move a flight control to change or maintain a bank or pitch. If flight controls are randomly moved you are inducing bank or pitch and cancelling it before it takes place and feeling good about it. In conventional aircraft one can literally feel the resistance of flight controls against the airflow and you can judge when intervention is required. In B707 during base flying it was very evident who is giving unnecessary input because it used to react late with lateral rocking while it was possible to fly it rock steady with proper handling.