High rates of fire are a colossal waste of ammo when all we need is a few well placed chain gun rounds to destroys inflatables, speedboats etc,,, Your point on reloading the CIWS is completely without merit. It's done almost as fast as the six barrel Gatling style gun runs out of rounds. Maybe an active duty gunner's mate can comment on this, but when they were relatively new weapons, we could reload them in less than 15 seconds. Understand, that this was the stated reloading time, not the actual time necessary to do the job. It could be done faster by highly motivated personnel. Prior to this guns system, we used M2's and M-60's which were insufficient.
Excellent explanation, thank you. Love the Fire in the Sky bit.
I guess the short answer is: different mission and the typhoon is the cost/effective tool for the job.