The entire purpose of a carrier is to launch and recover aircraft. If for any reason it can't do that, it is a floating pile of junk. The carrier I was on went dead in the water in the Indian Ocean with aircraft still in the air. Without a primary field being attainable, the secondary field was the ocean. Engineering got the ship running, at least enough to maintain steering capability which was about 7 knots, and we recovered the aircraft still in the air. If anything causes the threat of operations on a routine basis, that threat must be taken care of, no matter the cost. A plane or two in the drink would in all likelihood cost more than the change.