FCeng84
I should say if you could watch any modern jet with FCC's that control the rudder electrically especially during cruise at altitude. The rudder is in constant rapid motion to keep the aircraft in stable flight allowing for a more comfortable, clean flight not just to prevent dutch roll. The FCC's calculate and command at an electrical frequency of commonly 1600Hz. A good example of why could be explained by anyone who has had the pleasure of sitting in the back of a 747 classic.