When practicing, I noticed that in forte scale runs I always reach the bottom limit of every key I press, but when playing the same run piano or pianissimo I don't always reach the bottom limit.
So, my question is: How important is to reach the bottom limit of the key when pressed? Should the distance vary depending on dynamic (piano, forte, etc)? Is there an ideal/optimal height the key should end when pressed?
This happens on both MIDI keyboard and acoustic piano.