Armour made the large hangar and flight deck substantially heavier high in the ship. Leaving the aviation box unarmoured created a large vulnerable target above a cruiser expected to enter surface combat. The limited air group could specialize in scouting but could not sustain the fighter cover, reconnaissance, and strike mix of a fleet carrier. Separating the scouts from the striking carrier also sent reports through several command levels, where delay or small transmission errors could distort the eventual attack order. A cruiser division fighting in line could not repeatedly turn into the wind without disrupting the formation, so the ship's gun and aviation missions competed at the moment of contact.
Notable Point · 26:26-29:01
Why the hybrid inherited both ships' weaknesses
Large aviation structures, limited fighter capacity, gun-line exposure, and incompatible maneuvering requirements undermined the flight-deck cruiser.