> I don't see any compelling evidence that the US couldn't open the straits if it really wanted to, it's just that the cost in lives and hardware would be unlike anything the US has seen since Vietnam, maybe even the second world war

The US invaded Iraq and toppled its government; Iraqi militias are still firing drones and missiles at US bases. Tankers and oil infra are much softer targets… all it takes is hitting one or two tankers and folks will stop shipping.