I agree that hanger space is at a premium, I always had to double up coats and jersies on my hangersNo, their purpose is to schlep a MEU anywhere around the globe. Deck,hanger and welldeck space is at a premium. Slinging Hornets isn't in the cards.

They could still schelp a MEU with an angle. But now the MEU could have Hornets vice Harriers if you need a bigger stick.
This is to say nothing of the LHD's secondary Sea Control mission. You could have hornet top cover vice AV-8 (because I tend to think it might be hard to squeeze AV-8s out of the USMC to cover ASW ops).