Always an interesting topic regardless of Nation
I have often wondered why Naval Fire Support (NFS) is often poo poo'd. It seems to me that it is often forgotten and added as nostalgia in the form of a single relatively small caliber gun mount (5" or smaller). I have often thought that there should be a role for NFS appropriate to the planned operating environment. NFS should be a combination of large bunkerbuster calibur types and small secondary types of which are currently the primaries on most ships. They don't need many mounts given what automation can do.As was pointed out by a previous poster, failures happen. Have some redundancy (more than one mount). Keep in mind the enemy can shoot back.
Additionally, I rather think fighting pirates and similar missions ought to be left to the smaller ships using guns but capable enough to supplement the fleet as escorts. As such should be blue ocean types. Small ship threats can attack a fleet/cargo ship/tanker/etc anytime really. Why not adopt the approach the Somali pirates are using? A mothership (can be the NFS platform) carrying the "coastal types" as interceptors. Your interceptors are basically patrol boats with small (squad/fireteam?) troop levels and the mothership provides any big guns needed should you need to put troops anywhere. No missiles necessary (except maybe CIWS type stuff) as that is the job of the escorts.
NFS seems to be a capability gap in most of the large navies. Bullets/Shells are *a lot* cheaper than missiles, planes, aviation fuel, and etc.