I'm still surprised that people believe that a sole battleship is suppose to be fighting alone. I would agree that fighters should have more impact on bombers, because of course that 6 fighters cannot take care of 3 bombers, and there should be a focused push to encourage group play.
Capital ships... really have no purpose without player bases (and were just as useless before they ever existed) they're a stigma and RP element. Fun for battles. Very fun.
To expand their uses battleships should have power to wipe out bases. As intended. To expand bombers uses they should be able to gangbang a battleship. To expand fighter uses should be able to adequately defend a battleship against bombers. Gunships are the catch all for fighters. Too weak, and slow for bombers. So fighters cover caps and gunships. Gunships defend the fighters from other fighters. It's all just battle tact theory.