Of course Japan and Korea won't attack first, but if China never fires the first shot then this whole discussion is moot since this whole discussion is about reunification, if Taiwan is unwilling there's only one way for China to take Taiwan, so what is the point of not considering that they will get involved?
Additionally the survival of Taiwan will become a existential concern for both Japan and Korea, if Taiwan falls and the US doesn't stop it, what's stopping China from attacking the other two? Even if those two countries have to expend their entire military they will fight for it, after all this would've been the line in the sand that must not be crossed.
This is ridiculous logic. On one hand you understand this is the settlement of the civil war, but then you throw out a strawman invasion of Japan and South Korea. Using this fallacy, if the US is willing to attack mainland China, what’s to stop them from trying to conquer the entire country like Iraq or Afghanistan?
Plus you entire skipped the reality that North Korea would equally face an existential threat if South Korea decides to join in US shenanigans against PRC.
The point people are trying to make, it would be best for Japan and South Korea to stay out. However you had proposed a tripartite naval blockade.
That wasn't my main point, just an aside comparing China's inability to damage the western allies manufacturing centers while the West could conceivably do just that. My point was that strikes on High end chip manufacturing for IOT devices and Smart phones takes years to repair and does not seem to be as impossible as some posters here have implied, this would seriously damage the high value electronic device industry that would slow down the Chinese economy.
There's already examples of dense air defense not being enough to stop strikes in Ukraine, so why is everyone so sure that the Chinese AD is impenetrable?
No one thinks Chinese AD is impenetrable. However, you are saying that 16 LRASM from a single B2 can cause irreparable damage. Then you expanded this to continuous long range strikes from any missile in the US arsenal. Ukraine has nothing in the kind of air defences China has, no AWACS, no navy, no CV with combat air patrols, no long range fighters, etc. etc. This line of argument is equally as bad as nuking Tokyo, which mind you, the OP only suggested as a result of a Japanese unilateral intervention. On top of this, slowing down the Chinese electronics industry is slowing down the Global electronics industry, so the economic damage would be mutual.