...why would the other heroes in the JL need to be changed, even if they take place in the same fictional universe as Nolan's Bat-movies? Say what you will about those movies being "realistic," but that trilogy started with a band of ninjas rolling a dehydrating bomb across a city on a train, and ended with Batman tethering a bomb away on his flying ventilation fan.
My thoughts exactly. Even weirder for Man of Steel.