We need convention AC carriers too. Waaaay cheaper to build and operate, same offensive punch and same mission capabilities. Damage control is much easier on a conventional ship.
They managed to sneak a few of those back into the fleet. Compare the World War II Wasp (CV-18) to the current Wasp (LHD-1)
Length 872' -- 844'
Beam 93' -- 106'
Draft 28'7" -- 26'5"