We employ helicopters and fixed wing to monitor, hunt, and if need be, destroy submarines. Destroyers are also competent submarine hunters.
Nothing about what you’ve said is inherently “false”, but you’re not accounting for the ways we fight submarines (mostly aircraft.) Cruise missiles and boomer submarines are a threat, but the technology has been around for long enough that if subs were to become some super weapon because of it we’d have seen it by now. They serve their purpose well, and we have more than a few ways to defend against them (once again, mostly the aircraft from those carriers you insist on pretending are going the way of the battleship.)
Go look up the history of Naval ASW, from the VPB squadrons that flew Pioneers and Catalina’s in WW2 to the modern platforms that VP and HSM squadrons use. It’s a really interesting progression of technology.
ViperActual