Let's do some math

>China naval shipbuilding capacity is currently 232 times that of the United States https://www.csis DOT org/analysis/unpacking-chinas-naval-buildup
>China will have 50% more naval ships than the US by 2030 (more modern too)
>Massive infrastructure expansion in the south china sea (ports, islands, missle silos and railroads, submarine bays, dry docks
>The distance from the US to Taiwan makes it extremely vulnerable to supply disruption

The pentagon has done was games where the allied would have a very high material and high personnel cost pyrrhic victory and that doesnt consider the aftermath and a new invasion after all allied was assets have been depleted