It's not just a battleship vs battleship problem.
First there is the Battlecruiser for UEF that decimate navy easily.
Then shields. Any faction can have shields on water, or/and nice t3 subs but cybran.
ie. add 8000 hp / Bulwark.
And at that stage, stealth is easily countered.
And take in consideration that if a cybran must attack a base with his battleship, he needs more of them then others faction against it, because aeon/sera/uef shields are cheaper, stronger, more regen, and easier to spam.