There are so many people here against subs and cv. But i CV and subs were in historical naval battles so i cant see reason why to not add them.
I can see that hunting a sub with DD could be interesting, but i my opinion method what is used now could be changed.
So my question is: why are u so afraid of subs? Are u afraid that after u camp behind island all game u will get the torped? Or why are you so against it? I can guess that only for CV and BB is sub a real thread. Also interaction between CV and subs could be interesting. And after all i cant see that CVs are OP in current games, its sometimes really quite hard to not get all planes shot down when attacking high tear ships.