Speed of launching and recovery is what carriers have been "all about" since their inception. Their planes are their weapons, and weapons not in the air are useless weapons in this instance. So, the goal is to cycle aircraft in bulk as fast as possible. Consider auto racing and pit stops. If you study their history, you'll find it is all about shaving literally seconds off of the time spent pitting. Those seconds are crucial to the race, and over time, shaving off more and more of them amounted to minutes saved. Significant time in a car race.

The new elevators are fractionally faster both up and down. Between eleven of them, the few extra minutes off gained moving ordnance really does make a difference in cycling the wing off the deck faster. In combat, that can mean the difference between an armed group of planes between you and the enemy, or a group of planes still parked and arming.

Also, the new elevatotors have fewer moving parts, thus less to maintain. A bitch to install...millimeter tolerances from what I understand...but then less to maintain after.