The large modern composite is a large ship.
There are actual reports of badly damaged freighters getting back to base despite enormous damage, from torpedos, bombs, evan mines...
Bulkheads can contain the flooding. Water pumps can eject the water if the flooding is not serious. Damaged engines can be repaired over time.
Just like your damage control team works hard, so is theirs. Trying to stay alive...
I find this very realistically done. A big bravo to the RFB team for their efforts to create these sinking physics.
You can shoot a hundred shells to a ship, but it will not sink. Happened many times in real patrols. Except if the shells are properly aimed to create additional flooding.
Of course, one can always return to stock sinkings, shoot the masts only and the ship sinks...
