On rare occasions long levers end up pinching fingers during a crash. I know more than one who are now missing a little finger and or the one next to it. You see a number of racers with missing or stiff little fingers. Nick Ienatsch has a bum little finger on his left hand & I believe Roger Hayden has a finger missing at the middle knuckle. My son also has a stiff little finger on his left hand. Lever guards help to avoid mutilated fingers that get caught under the lever.
However, if you never crash it's a non-issue!
A photo of my son's finger. His emergency room visit lasted 4 hours from arrival to departure and was $22K. A $75 lever guard would most likely have avoided this life changing event. His finger is now slightly bent and stiff from the first knuckle out.