Most control system of fighter jets (if not all?) in US operation are designed to be unstable in the Nyquist plot to begin with (layman terms, designed to be un

Most control system of fighter jets (if not all?) in US operation are designed to be unstable in the Nyquist plot to begin with (layman terms, designed to be unstable like balancing a triangle on its tip). Downside is that your need special on board computers to always actively push the aircraft back into the stable region. Upside is that you maximize frequency response (whatever that means in the block diagram).