In the novel, no precision ordnance is available and the attack plan
requires flying into the evelope of both SAMs and AAA. When queried by his
skipper as to his conclusions, the protagonist says "I've become a big fan
of attack submarines lately."

Against a Soviet SAG of the 80's with gravity weapons would likley end up with
all the ships still floating and whats left of the strike group floating as
well. Not a good idea at all.
Sparky