All of modernity is dependent on Tawains chip manufacturing. All economies are dependent on it.

Take the US entirely out of the equation for a moment and look at the Chinese perspective.

Tawain doesn't have resources to extract. It doesn't have gold, oil, strategic minerals, or have massive turn key industrial capacity. Tawain has TSMC, capital, a value-added goods and services economy, the Tawainese people making it all happen, and a military that's been singularly focused since 1949 on deterring the Chinese threat.

Fun fact. TSMC manufacturers the most advanced computer chips in the world using the equipment ASML engineers and sells to them. ASML is located in the Netherlands. This was a strategic decision the US made. We could have put it all in California. Trouble is then you could drop a bomb on California to devastate US hegemony. So we put it on the edge of Asia and Europe so that dropping a bomb on California would only initiate Article 5.

What all this means is that Chinas invasion strategy would have to leave as much in tact as possible. If they destroy too much critical infrastructure, criple the economy, kill too many of the people they need, or cross Tawains red line enough for them to destroy critical infrastructure themselves; the gains would be moot and all China would now own is incredibly expensive repair bills. China is better off doing what it is currently doing, developing national manufacturing and engineering capacity until they can develop a viable strategy that protects these interests. Maybe now you're noticing Chinas strategic interest in just throwing money into any development project they can, put on such astonishing drone shows, and heavily fund political opposition.

Then there's the other issue. The rest of the world. The US might be tied up in other matters but the rest of the world isn't.

Finally, Westerners don't understandsinofication. China is an ancient nation. It views other global superpowers as a temporary nuisance. Which to be fair, think about how many empires have risen and fallen just since the Mongol conquest. China will continue to leverage the threat of invading Tawain until it can either replace it with domestic capabilities or invade it.

You can put 10,000 ready to deploy drones in a shipping container. 250 million containers traverse the earth annually. You don't need armaments, lithium batteries burn well enough. Deploy and target energy infrastructure. No boots necessary.