I see this first and foremost a safety issue, but also helps to "speed" up the game (like hockey needs speeding up). Time is wasted in chasing down a puck that will ultimately be called icing and a face off. Make the call sooner, no one gets hurt and time is spent on playing the game. A little like the intentional walk in baseball, time wasted throwing four balls to the plate.
Plus, that little bit of time will make it tougher for the icing team to recover. It might be a few seconds, but they can be important.