From what I've seen, DB takes great pride in FD being the leader in using cutting-edge technology. I think they did great work in making the choice of input devices irrelevant: joystick, HOTAS, gamepad, MKB - anything goes and no device offers significant advantage over others.
If they'll give actual physical characteristics to my body (such as inertia), it would make it both realistic and irrelevant which input device is being used.
One great example are mounts in Guild Wars 2. In every other game you can make a 180 turn almost instantly, but in GW2 your mount is heavy, has inertia and because of that it takes some time to make a turn.