I’ve seen fast carriers help in 2 specific situations:
1) Japan forgets that the Pearl Harbor Carrier and fighters can get to SZ 61 resulting in the loss of all of Japan’s unprotected transports.
2) America builds one last carrier and two fighters for that assault on SZ 60 (SZ 55 to SZ 60 is 3 spaces.) Or even just buys two fast carriers so the 4 fighters in W. Canada can reach SZ 60.
But how often does that happen?
How much better off would naval warfare in the Pacific be if America had 3 fighters on the flight deck of a carrier, or could recover a bomber on an empty carrier?