Rogues hate unpredictability. Chance is what the others will try to stand on, and a well-prepared rogue will pull that pillar out from under them. Rogues perform at their peak efficiency when they're setting the tempo. While it may seem like chaos to the uninitiated, a veteran rogue is always in control. In order to properly manage our energy, combo points, and cooldowns, we need to stay several steps ahead of our opponents.
Our talent trees and rotations reflect our love of predictability. Aside from the occasional talent like Ruthlessness, we don't rely on chance for anything. In the past, chance has encroached on our playstyle in a few areas, but those have largely been eliminated. Cloak of Shadows and Sap are now guarantees, and we don't have to hope that we get lucky with Initiative or Vanish. Our rotation is in always our control.