Because it is my deeply held belief that those are the methods that will bring China victory.
Then you should be taking a more minimalist/pessimistic position, which will allow you to appreciate the capabilities that the PLA would need to ensure victory.
By taking a maximalist position, you are assuming that the PLA will roll a "six" every time for every strategic decision and weapons procurement that they make, and assuming that in the real world, that would be the case.
Instead, if you took a more neutral position (the equivalent of rolling a three or four), or a minimalist/pessimistic position (rolling a one), you would recognize the requisite capabilities they would need to ensure victory even if their strategic decisions and weapons procurements don't end up as successful as they intended.
Avoid adopting positions where you can "achieve victory" and instead think about realistic ways in which defeat or failure may emerge instead. Don't get comfortable.
That is to say, think about what capabilities one would need to be capable of achieving victory even if one rolls only "two" or "three" (or even a "one") every time. The more you do so, the higher the guarantee of victory.
If the nuclear dynamics were strictly bilateral, i.e., if it were just the US and China I would give this point more weight. But as I mentioned previously, Russia has been roped into this whether it likes it or not (and I suspect it's the latter). Russia's response is a significant (I would even say severe) constraining factor in America's reaction to China's buildup. Although Russia isn't exactly rolling in money these days and would be loathe to go on a major buildup of its own, it's perfectly capable of doing so given its vast nuclear industry and massive stockpile of fissile material.
I doubt America wants to play a game where every new warhead it builds is matched by a new Russian and a new Chinese one.
See what I wrote above about rolling sixes and ones.
Seems reasonable, although I would put it closer to 10 than 15. On the subject, have you heard anything recently about the DF-45?
I don't expect it to emerge in the earliest service-able state until 2030, and naturally would take a number of years for a large number of them to be built.
Writing what I advocate China do to US allies who involve themselves in a war between the US and China would probably violate the rules of the forum. But at this point I'm sure it's not hard to guess.
Given the rapidly escalating costs US allies would pay if they helped the US, I'm dubious of the view that they would intensify their alliance with America. I have the old-fashioned view that the most important factor a country considers when it thinks about going to war is whether or not it's going to win. US allies doubt more with each passing day that they're on the winning side - if I were them I would start looking for the exits.
I wrote about a number of things, including US alliances, US nuclear posture, US countermeasures, and that trying to account for all of them together would be difficult and cannot reasonably allow us to project at this point in time, the extent and degree of success of Chinese MAD/MV over the given period of time needed to achieve it.
I agree that conventional IC-HGV strikes against the US is a quaint idea, which is why I don't advocate it. I have a 1 kiloton minimum on an IC-HGV - that's just price of admission. A conventionally armed IC-HGV is a pea shooter.
If you are suggesting that China would be willing to use a IC-HGV tactical nuke in a first nuclear use strike against CONTUS (even "only" military targets), that is a significant degree of escalation even higher than the idea of using IC-HGVs in a conventional role and is frankly so far beyond what we can model I don't even know how to approach it.