[ericthered]

With the submarine vs. surface ship question, another possibility is that everyone is visible, but the water provides decent protection, so everyone hides beneath it. Its like having a bunch of armor.

I suspect that with TL10 technology, all wars are either nuclear doomsdays where only truly stealthy forces survive, asymmetric conflicts where navies provide support roles, or limited engagements where the naval forces are used for bluster rather than starting anything that could trigger nukes. We don't know what the winning strategy for TL8 is, let alone TL10. The poster who suggests a number of strategies without knowing which one is right has a solid scenario.