Plus, obviously for RB, birds do not fly in Class A or B airspace
The problem with the speed is that you cannot 'tell' an autopilot to lower the nose and increase speed without......... We all remember the poor A/T/pitch performance of the Classic, particularly after the A/T repsonse was 'softened' around late 80's, and I have seen significant 'excursions' on the NG too.