On the other hand he did go from being known as "William the Bastard" to being known as "William the Conqueror".
It is also illustrative of the advances in medical science. As one of the richest, most powerful men in the world, William could only wait for the inevitable horrible death which took 5 weeks to happen from the date of injury to when he died. Today, these kinds of injuries and worse are routinely treated in trauma centers all across the world.