"Independence means war."
Yeah, it almost always does. The British said that to the Americans in the 1770's. They suffered a humiliating defeat. So too will the Shi-Na Minzoku if they fire a single shot across that strait.
Taiwan has been a fully independent sovereign state for every single day of its history except for a stretch between 1945 and 1949. No Chinese government except Qing (which wasn't even Chinese but was Manchu, and the Chinese were the lowest slave caste in its ethnic hierarchy) ever held dominion over Taiwan, and their dominion was limited to a handful of colonial cities on the western coast of the island.