You are right of the unarguability of US manufacturing against Imperial Japan's, but that inevitability still doesn't eliminate the time recapturing territory that had Japanese presence. Their no surrender policy made island recaptures slow, brutal and ugly. Even with carrier provided air superiority.

Had they got to Hawaii, I imagine the experience would have been similar to all Japanese occupied territories -- famine, brutality, extensive forced labour and systemic murder. So long as the troops are fed, and enough comfort women can be found, nothing much else mattered...