About updated aircraft, if you read a history of a USN aircraft carrier in the Pacific in WW2 they are constantly transporting new aircraft west and then transporting "war wearies" east whenever they had to return to Pearl Harbor or to the West Coast. The lifespan of a war plane in WW2 was not very long. Certainly not long enough to be seriously upgraded.
You may be underestimating the USN's final ability to resupply ships at sea during WW2. Here's a splendid link on the subject.
https://www.history.navy.mil/content/history/nhhc/get-involved/essay-contest/2017-winners/additional-essay-contest-submissions/a-century-of-replenishment-at-the-sea.html
I have written a too-lengthy appeal for you to do an episode (probably a series of episodes) on Nimitz & Spruance & Halsey. The link above ties in with that. That Spruance and Halsey were unlikely best friends before the war; and that Spruance became Nimitz's Chief of Staff after Midway -- a position he even continued to hold later in the war BETWEEN periods in command of 5th Fleet. Are just some of the ways the stories of these three officers overlap and are essential to a real understanding of the US Navy in the Pacific War.