Someone above made my main point. It's not one ship getting the extra bang...it could potentially be all ships.
A big part of the game is figuring how much you need to throw at a ship to actually kill it. Why, because cripples can still fire their best gun (or more) and are still a sink. If you didn't kill it outright, depending on the ship, you have effectively not hurt it at all. Being able to gamble, on getting close enough, and then gaining more guns is a big deal in firepower multiplication if used right.
Trying to downplay it by using the least optimal conditions (one ship getting to use it, and not being able to use as a fire decision element) is a a pretty poor argument.
Ripple