Midway was going to be a stepping stone to Hawaii (because the American fleet was going to be annihilated and unable to take offensive actions) , but remember the goal of the operation was to draw out the fleet and destroy it, NOT capture Midway.main
You need to also remember that the Japanese were terminally ill with victor's disease at this point. And most of the higher level leadership had been infected for years.
It is and was a fault in the Japanese culture that the person in charge is always right and subordinates are to obey blindly. If the person in charge is brilliant, that's not a bad way to go. If the guy in charge is mediocre or worse, this is a very bad way to go. Plus, once a plan was adopted, changing it is almost impossible (to change is to say the planners were wrong). Yamamoto was a brilliant tactician and strategist, BUT, he was still under the guidance and control of the Imperial Naval Staff, and they weren't. The Japanese also loved multifaceted plans and this lead to all mthe various groups proceeding more or less independently, instead of concentrating in one force and bulling ahead. Had they concentrated and bulled ahead they would have swept us off the seas. Ignore Midway, their contrated forces were far stronger than anything we could have put together.
The Japanese had decided they were right, and superior to the soft Americans, that the Americans were not willing to fight for the Phillipines or the British or Dutch colonies. And if the Pearl Harbor attack was successful, the Americans would appease and negotiate rather than fight.
This view of America's unwillingness to fight was reinforced by the Panay Incident and the removal of US forces from Shanghai, etc. Their technical superiority views were reinforced by the success of the Zero, their torpedos , naval night fighting abilities and the possibility that the Yamato class BBs were superior to anything at sea, and those items were great, and may have been best, but they had little or no follow up programs. However, many of their weapons were obsolete and their employment was faulty. Hence the failure to use the Japanese long range subs to interdict reinforcements of Hawaii, feeble attacks on the CA coast instead of attacking the major ports, a plan to blockade Hawaii after the attack, etc. By the time the Japanese realized that their views on the United States and it's fighting ability it was too late.