I know this very well, but the point is that this is irrelevant anyway, because the relative movement of the carrier matter much less than the difficulty of cat

I know this very well, but the point is that this is irrelevant anyway, because the relative movement of the carrier matter much less than the difficulty of catching the hook. Whether you match the speed to the carrier deck or to the ground makes (almost) no difference. It's not as if the carrier was suddenly accelerating while a plane lands. Catching the hook while the plane is in a controlled crash, that's the problem.