Sgaz (please forgive the misspelling of your name) has brought up some good historical points and the IJN Fleet. What was said about the ships ending up being irrelevant is 100% true. However, your interpetation of the IJN doctrine is quite incorrect. Yes, they understood the importance of airpower. However, they still viewed it as a supporting arm. The IJN continued to believe that surface ships were the decisive form of combat. In fact, their plan for destroying the US pacific fleet in pre-war manunvers was to use air power and torpedoes (SS/DD/CL) to wear down the main US fleet, then for battleship guns to finish them. Other examples of IJN gun mentality that dominated the fleet.
After all 4 fleet carriers were destroyed at Midway, Yamamato used the 4 CAs in the bombardment fleet to try and lure TF16 and TF17 closer to the island while he got closer with his Main Force's battleship guns. Also to note in that Battle is that even after Nagumo lost 3 of his carriers, he started manuvering with the screen of battlecruisers and destroyers in an attempt to engage the US carriers! This actually left Hiru behind a bit and ultimate brought her close enough to be destroyed.
During the campaign in the south pacific, the japanese fought with practically no air cover. They had superior night fighting and torpedo forms of combat and tried to engage both the airfields and transports, as well as US surface ships at night. Four major surface engagements were done with no aircraft. The main force for those engagements were Hiei, Kirishma and their destroyers and cruisers.
Even late in the war, during the operations in the central pacific, the IJN carriers were used as a diversion to draw the US fleet into a trap so their battleships could engage. It was stated that the carriers had no aircraft. This hardly was true as the Japanese used piles of Zero fighters as Kamakazes all the way to the last days of the war. Conversion of the Ise class to hybreds was still viewed as supporting the battleship line. The japanese never gave up on their view that battleships were the main force. Also, it should be noted that the japanese had no need to build additional battleships as the only losses that they had early in the war were 2 of the Kongos. Aircraft carrier losses were much, much heavier. The japanese were so brave and so fatalistic that they threw away assets in situations without hope. Had they presevered them better, the war would have been a lot longer.
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