While it's true that not many weapons can be equipped on a carrier, it has a catapult, and can support a great number of fighters. Carriers have good Mobility despite their large size, and plent of space to install modules, making them highly customizable. And if high-performance fighters are loaded, carriers can have attack capabilities every bit as good as battleships. "Carrier" is abbreviated as "CV" on the battle screen.
Small Magellanic CloudEdit
Large Magellanic CloudEdit