“So what happens if the onboard computer stabilization system is knocked out, either in combat or by electrical failure?”
That system is unlikely to fail unless there is a general systems/power failure. In that case, in combat, the ship is effectively neutralized anyway for all military purposes. And a sitting duck.
It’s been a few years since last I was at sea but I recall “losing the load” to be an unfortunately frequent occurrence. It’s a very unsettling experience to find yourself in a silent, completely dark metal box that is moving around under you. Mr. Flashlight was my friend.