How much height do you use in piano playing, or may be not at all? What it's about here is the position of the fingers in connection with the keyboard.
If the keys are touched every time from the same height, may be an equal volume of sound for chord tones are more easily obtained... Not quite sure.
There are different schools. According to Leopold Godovsky, one of them is characterized by a pressure touch, another one is characterized by weight playing.
Some pianists like to use more height than others. Do you thing it has something to do with the aesthetics of sound?
Topic: Height in piano playing