Its a huge post in and of itself. But long story short, Taiwan is key to maintaining a US blockade on China. China's huge marine corps, airborne forces and amphibious assault force means they have the means to quickly take Taiwan.

Submarines and cruise missiles are a daunting threat to US carriers and the US navy will be forced to stay at stand off ranges for a while.

Carrier borne sortie rates are low as it is and greater range will decrease it further. In contrast, the vast Chinese air force can maintain huge numbers over taiwan which is just 300 km from the coast.

The US can't stop them from taking Taiwan and its impossible for them to libeate Taiwan D day style due to the fact that Chinese coastal missile batteries will decimate any assault ships