The Taiwan Strait is nicknamed the “Black Ditch,” High winds, rough seas, 3-6 Typhoons a year, over 100 miles from the mainland. Very tough for CCP to take it back with a conventional invasion. Now a blockade? That could be a very big deal. Would the US do anything about it other than some sanctions and finger-wagging? Probably not, especially not if Biden and gang get into the WH.
Remember the Chinese Communists also plan on blocking and controlling all shipping crossing the West Philippines Sea with their fake island naval bases. That will cut off all trade going to the US from SE Asia, Australia, India and the Middle East. Lucky Malaysia cancelled a huge Chinese Communist development that could have closed off the Singapore Strait between Malaysia/ Singapore and Batam, Indonesia
The weather in the Taiwan Strait being as bad as you point out would make a blockade difficult to maintain except by aircraft (daylight) and submarine. Great for sinking ships, but ill-suited to warning a ship to turn around or prepare to be boarded for inspection. And if one or 2 of the PLAN submarines fail to “check-in”? What then?
Run it with shipment of whatever and see if chicoms fire on a US flagged ship or warship. Have some SSN’s in the bullpen and if they fire turn’em loose and send the chicoms to Davy Jones locker.
If the chicoms think they are losing the mandate from heaven to govern they will pick a fight with Taiwan or Japan or both as a distraction in an attempt to retain power.