Can u tell me what these smart ammunitions are?
Nothing new. Proximity Fuzing 40mm Bofors have been a thing since WWII (really) and you are right about a single barrel not being enough. In a saturation attack that barrel will overheat and melt.
This is from WWII. Bofors L60 USN mount.
and this is the British QF 2 pounder 40mm in an EIGHT gun mount.
Remember even these were not enough. USN cruisers and destroyers would have many quad and double 40mm mounts, all around the ship, supported by Oerlikon 20mm guns in similar numbers. EVEN then kamakaze attacks got through and knocked out capital ships. CAPITAL ships, defended by many other ships, and long range DP 5inch guns.
So, yeah - one measly 40mm gun aided by modern FCR aint gonna cut it.
I dont know why know one has brough back these behemoths - with modern electronics they will be terror on the battlefield.