Phaedra said:
There is no difference in the relative speed limit compared to the frame of reference for either FA On or FA Off. Also, both FA On and FA Off have exactly the same degrees of freedom (and the same maximum thrusts from each thruster). The only difference is that your input is interpreted differently to produce different thrusts depending on whether you have FA On or Off.
I agree with all of this except the maximum thrusts part. Try testing the following: In FAOFF, accelerate your Cobra to maximum lateral (or vertical, doesn't matter which) motion. Use your lateral or vertical thrusters only to decelerate back to zero, while timing it.
Now, accelerate back to maximum speed, but instead of manually decelerating, just turn flight assist on and let the computer handle the deceleration. Notice anything different?
It should take only about half the time.
In any case, the fact that both modes already are very similar to each other in terms of what they can and cannot do is actually a pretty strong argument for adding an "in-between" mode that only stabilises rotation. I am fairly confident that people using such a mode, regardless of how elite pilots they are, are not going to gain some huge advantage from it. Full FAOFF should still be there, as it's actually great for certain tasks - such as docking.