Simmering the chicken in water or boiling it really isn't a necessary step to prep it for broiling, baking, grilling or pan cooking it.
While you can get tender chicken by simmering it in water, that's not the only way.
Proper mangement of time and temperature will yield perfectly cooked, tender chicken with any of these cooking methods.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan