Has anyone observed that Miwa Harimoto's footwork for receive is very unique? She stays close to the table, moves one small step away from the table when her opponent serves, and then usually move back for short receive. Maybe it is a personal habit, but it is quite different from almost everyone else. What is the benefit of this?
Try it at the table yourself.
Stand still, in position and ready to receive serve. Now move, back as if receiving a long serve and try again, moving fwd to recieve short.
Do this 5-10 times from a stationary position.
Now do the same but make a little hop before moving, or a little hop back to be like Miwa.
You will find that it's much easier, smoother and more fluid to make the in or out move if you are already moving; more easy to do it smoothly than of you are standing still. When standing and trying to make a big move it becomes 'jerky', or like a lurch.
In Miwa's case she just hops back 'in' to exactly where she needs to be if the serve is short. And as someone already said she is already prepared for the long serve to BH, ready for pivot if needed.
So it's basically just a movement to ensure she is never stationary.
Stationary is a death sentence at the speed of the pro game at that level.