Why late-war Japanese carriers lacked an effective air arm

How dangerous would three late-war Japanese armored-flight-deck carriers have been?

The ships and aircraft could be capable, but Japan lacked enough experienced aviators, carrier crews, and damage-control personnel to use them effectively.

Late-war Japanese carrier and aircraft designs could be powerful, including ships such as Shinano. The decisive weakness was human: experienced aircrew, carrier operators, and damage-control personnel had been lost and could not be rapidly replaced. Japan had failed to husband scarce personnel, so its fleet capability could not be measured by hull numbers alone.