I am often confused by the exercises Army and Marines that center around fighting a ground war with China. Just where do they envision this ground war to take place? In Taiwan or in China, or both? If Taiwan, what if Taiwan refuses American military to come onshore full-force because they fear a clash of two big army forces will simply turn Taiwan into a smoldering wasteland, does that mean US will invade Taiwan anyways just to prevent a China take-over? And if China, does US really think invading China is a good idea (or even an viable idea?) I guess they could invade and take over islands in SCS. But that would that accomplish? The same exposure that allows them to invade and perhaps succeed also exposes them to the counter that will inevitable come. So what are these ground-war exercises really telling us?
You're overanaylizing it, their entire wargame was implicitly based on assuming they'll have access to Chinese exports, theres not enough strategic thought behind it for it to represent any long term plan. Closest it comes to actual plan is USMC's Force Design 2030, which is just island hopping in Pacific with missile trailers because they cant imagine an enemy with an airforce or drones.
If we're purely imagining a ground war between US and China, as the dominant shipbuilder and civilian cargo transporter on the planet, China is the only one with the logistic capacity to actually supply a near peer ground war across an ocean, so it'll be in either Australia or, if nukes dont come into play, CONUS