There is no question that a modern offensive submarine could sink a carrier. Theoretically a carrier group should be able to detect it but it’s a very real thre

There is no question that a modern offensive submarine could sink a carrier. Theoretically a carrier group should be able to detect it but it’s a very real threat. The exemple you give for the relevance of carrier is not a symmetric conflict. Thankfully the equipment available to the Islamic State was garbage compared to what a modern army can do. In a conflict between for exemple the US and China, carriers would be useless. They would probably be amongst the first things to be targeted.