The discussion about lack of inertia, I agree with. FBW or not, it is not possible for the FBW to react at the same time as when physics acts on the air frame (if it did, it would have to mean that FBW can predict where aircraft will be moved, in order to counter-react this force, which is not possible). There must always be some time delay when force acts on air frame, and FBW and control surfaces to react. So I think the FM needs tweaking by first, adding time needed to move the control surfaces (right now they are instant) and second, needs to add small time delay for FBW to react on air frame movement adjustments. That I think will add the missing natural flight characteristics that I also feel is missing.