A CIWS installation is 7 tons by itself, not including ammo. Add to that the tons and tons of scaffolding and decking you’d need to install one on the side of a carrier hull... and then realize that a CIWS cannot shoot straight up. So you stick a bunch of them on a carrier and now have a top heavy carrier that’s still vulnerable to plunging fire and will roll over in a stiff breeze.
“A CIWS installation is 7 tons by itself”
1/5 the weight of an F-35
A carrier is over 100,000 tons. Installing 100 CIWS would STILL be less than 1% of the carrier's displacement.
What's your point?