Schell says that the goal of a game interface is to "make players feel in control of their experience." 1
We achieve this with immediate feedback from interface interactions, including second-order motions. These make the player feel powerful and in control, leading to a fun experience.
Schell, Jesse. The Art of Game Design: A Book of Lenses. Amsterdam, Boston; Elsevier/Morgan Kaufmann, 2008. (pg. 884) ↩