It is not. It's both necessary and the best strategy, given the huge and increasing power disparity across the strait. This is also not the era of Normandy. I'll not go into details for obvious reasons.Reliably making quick work of a huge Island fortress is an optimistic bet.
You lost me. Protracted blockade invites external intervention, on the contrary.Blockade is meant to prevent things from coming from both directions, including the outside. In the worst scenario for an attacker, it at least buys time for possible intervention to come.
A blockade strong enough can prevent intervention altogether; a flicky blockade with sinkings here and there won't be as much of a deterrent.
Summing up, in the grand scheme of things, they don't matter all that much. Taiwan is so far behind in submarines technologies, it'll be too little too late.Summing up, submarines matter.