But if they’re at war, that ties up a lot of their resources. They’re currently using their military strength to claim international waters in the South China Sea. If they get into a war with Taiwan, they can’t back that claim up. The countries which are being unfairly denied those waters can assert themselves without fear of significant reprisal, and the US would be more than happy to aid that.

There’s really no sensible reason for China to go after Taiwan, it’s complete bait. They stand to lose far more than they stand to gain.