Grounded27 - Please explain?!
Grounded27 - I have read your entry several times and cannot make heads nor tails out of it. Please give specifics including examples of the airplanes you refer to. Jet commercial transports with swept wings have exhibited low inherent Dutch Roll damping at least as far back as the Boeing 707. Yaw dampers have been implemented to automatically control the rudder to provide the needed damping. Yaw damping represents one of the oldest and most successful examples of aviation control augmention.
Your reference to safety (and your infrence that older models are safer) is very concerning - please explain.