Commanders of all the navies thought in terms of Battle Fleets. If carriers had been seen as the main weapon why were modern Battleships still being laid down and constructed? What the Admiralty was worried about was always a lack of Battleships until well into the war.
The Japanese followed the same kind of thinking.
Look at their
Yamato class BB's
Yamato was ordered in March 1937, laid down 4 November 1937, launched 8 August 1940, and commissioned 16 December 1941.
Musashi was ordered in March 1937, laid down 29 March 1938, launched 1 November 1940, and commissioned 5 August 1942
Shinano was laid down in June 1940, in mid-1941 construction temporarily halted to allow personnel and equipment to be utilized for other naval projects in response to approaching hostilities.
1942, after the Battle of Midway, decision made to convert
Shinano's unfinished hull into an aircraft carrier. Launched on 8 October 1944.
So even after Pearl Harbor and the proof of what carrier-borne aircraft were capable of, the IJN was still going to build a third
Yamato class battleship until their losses at Midway forced a change.