The fine tuning of rotation and mass due to take-offs and landing actually helps make more sense of the limited timing you are given to land/take-off, and why there are such high consequences for those who fail to comply. Not only is it needed so that efficient use is made of the limited docking space, but the station's mass would make inertia a huge force, so compensating for changes in mass would need to be implemented at the right point in time to have an effect at the time the ship lands/takes off.