> If a heavy conflict were to erupt, China's supply chains would be cut off via naval blockade

Or possibly the 30+ fast attack submarines sinking every military or resupply vessel in the region, augmented by a colossal amount of rapidly-deployed naval mines.

Taiwan doesn't buy them much in this regard. Why would China be permitted to use sea freight at all in a "heavy conflict" scenario? Why not just sink these vessels near their origin - why allow Brazilian soybeans to even make it out of the hemisphere?