I've played a lot of games in Saipan in the last year or so and before the commander skill change this month the 1 point ability (now retitled Air Supremacy) used to give +2 aircraft on deck in addition to the -5% faster plane regeneration time. On many CVs the +2 aircraft isn't too noticeable, but on the Saipan and its clone Sanzang, those extra two aircraft are sorely missed.
I think if the plane regeneration time is going to stay the same, both boats ought to have those two aircraft per air wing permanent. Playing in randoms is hard enough if you're up-tiered (but almost too easy against tier VI boats) and those extra two aircraft are extremely important to being viable in the later stages of a game.
Thank for listening,