Exactly what I have been telling the "CIWS rules" idiots for years here. Mach 3+ buckshot on an aluminum superstructure means you are dead.
Yeah, you hit it, now what about that load of shrapnel coming at you?
You mean the shrapnel falling into the water? Not a dammed thing.
And if, if the intercept was so close that shrapnel impacted the ship, it’s energy is already dissipated or never reached a maxima sine the warhead would detonate low order.
It might leave scorch marks on the hull. That’s about it. Scrub and repaint. Next!
You make a very bad assumption about the physics of impacts. If the CIWS impacts the munition, it will, at an absolute minima, interrupt its flight path. Probably causing the munition to tumble.
Typically, the hit is so catastrophic that the fuze assembly is disable or damaged... no boom: But the possibility of a kinetic hit still. But then you have the whole interrupted flight path again.
And at supersonic speeds, tumbling leads to rapid, less than 250 milliseconds, disintegration.
There are some pretty good YouTube videos that show what happens to a supersonic body that gets clipped. It’s over quickly.
Does this mean that the ship survives unscathed? No. Does it mean it’s out of the fight? No.
That would be true if the incoming missile flew true after being hit, but I suspect that the flight profile might go a bit askew after it is no longer even close to being symmetrical.