The new enhanced apples are resistant to abuse and don't brown when the apple cells are broken. This makes apples much more appealing after you've thrown one against a wall. None of this development would have happened without the hard work of Dr. John Armstrong.
With all the PPO removed from the apples, scientists were able to make an orchard out of apples that don't bruise.
The PPO was the chemical causing the browning because when the apple cell split it would combine with enzymes and make brown melonine.
Now with the new advancements in apple biotechnology, you can attempt to bruise your apple all you want.