This idea that the US is protecting Taiwan for its semiconductor prowess (aka the "silicon shield") is a very confusing idea to me as it ignores the period from the 40's to the 90's when Taiwan had no semiconductor manufacturing that wasn't being done as well or better elsewhere, yet the US was a ardent supporter, to the point of almost entirely shunning the People's Republic of China over it.
It's a smart sounding idea (especially if you don't know your 20th century Chinese history) but the facts just don't back it up.
The reason we supported them back in the 20th century is because the Red Scare was the big boogeyman of the time and we needed military bases and friendlies in that part of the world.
The silicon shield is undoubtedly a significant part of the calculus around Taiwan, especially wrt direct military intervention. Successive administrations have clearly shown their emphasis on maintaining access to key strategic resources (the Middle East and oil).
As for the silicon shield, yes it’s probably a major factor, but not close to the only factor. If PRC realizes its claims over Taiwan and the South China Sea, the entire region, including many US allies, will be under Chinese hegemony. It would spell the end of the current economic order. Japan, Philippines, basically all of East and Southeast Asia would then be trading within China’s new backyard.
1) Revoking the mutual defense treaty which legally bound the US to defend Taiwan, replacing it with a more vague law where military intervention was not clear. 2) Recognizing the PRC as the legitimate representative of China.
To align your claims slightly, Taiwan also claims the same section of the SCS (actually it claims a slightly larger part), so strictly speaking it is what happens if the "Chinese claims" are realised (Taiwan and China work jointly to support their claims, ironically enough). In real terms the economic effects of China with respect to the SCS are greatly exaggerated for a number of reasons. First being that shipping can be routed through Indonesia. It is not a chokepoint, it just happens to be the shortest route. Second, blockades have little to do with recognising swaths of ocean as territory. These are enforced by navies, and most blockades in history have not happened within the blockaders' own waters (for obvious reasons). It is no easier for China to blockade trade in the region if it claims the SCS. And third, of all the major economic powers, China has historically been the least likely to enact economic warfare like blockades or sanctions. There is also a fourth aspect where in the current political environment, the globalised, trade based economic order is the least popular in the US and assorted European states, not China (who in fact desperately needs trade).
Weapons systems and strategic production capabilities are the one area where I think that DRM actually makes sense. Not printer cartridges and coffee. FFS.