Is it capable of other uses? Can it depress enough to hit a small boat, close aboard, say within 100 yards, in a port? Can it's radar pick out a plywood or even rubber boat in heavy seas with spoofed returns? A visually aimed system can, and without spray-n-pray expending ammo.
And to ADVERTISE this, so that some Iranian sailor KNOWS that if he gets within range, he's going to be unidentified flaked fish food. One BRRT! and he's a greasy spreading slick on the ocean.
Knowing is a powerful deterrent. To KNOW that some 19 year old infidel gets all tickly in the nethers at the thought of minced Iranian. You don't tug on Superman's cape...
Try searching youtube, “phalanx”.