What is the tradeoff and what regimes does this work in. Most of the modern VERY high speed fighters are using all flying tails that are all electromechanically mixed into all function of roll pitch and yaw in servo loops. But there is a lot of FBW divine intervention going on there. So at what speed and for what purpose, like avoiding flutter or PIO using mechanically connected controls with neutral stick force balance points does one avoid an all flying tail. I have been looking at Vtail all flying surfaces. Makes me wonder if the rudder vs. Elevator functions would interfere with each other? Orion?