There is a lot of this which I think is reflective of how things may go down if the balloon went up, but stating all of this in so confident of a manner in context of having an informational deficit (i.e.: not having done the operations research ala patchwork) doesn't come across very well.
I understand the overall westpac conflict scenario is one that you've stewed over for ages but you need to introduce some caution into the way that you are writing rather than conveying it as if it is preordained and guaranteed.
Very fair points by Blitzo so I want to justify my position and show this is just beyond common sense and doesn't require patchwork esq experience to understand.
Lets look at a 2030 scenario ORBAT for the PLA & US military specifically within the 1IC. I will allow the US in this scenario to surge 50%+ of their expected ORBAT here and show why its a stupid idea and that China's sensor/fires and A2/AD complex is so strong that it would be suicidal for the US to do so which is why I expect them to pull their air and naval forces IRL behind the 1IC and would hence have to go through onions of PLA defences to help Taiwan.
US forces :
AIR: I expect the US to have 1100+ 5th gen aircraft by this time. Lets assume 600 are within the 1IC across bases and 5 CVNs (5 CVNs is around 250 and 350 distributed around bases). AWACS : 90 E2-ds and 16 E-7s (if they can keep on schedule) so 50 within the 1IC. EW craft - F-15 EX 175 in the 1IC. I'm not including bombers here as one of the main advantages of B-21s is to loiter behind lines from far away protected bases using offboard sensors.
The US will be working off around 3 air bases : Okinawa , Yokota , Misawa. These bases will be crammed full of aircraft and juicy targets for the PLARF.
NAVAL :
Lets assume that 40 Destroyers and 12 frigates that are a mix of old PESAs and AESAs are here. Also lets assume some Virginias SSBNs. Also the aforementioned 5 CVNs
PLA Forces:
AIR: 1000ish J-20s give or take a couple dozen. minimum 500+ J-16s. 80-100 KJ-500s and 30-40 other AWACS. 100+ J35s
NAVAL: 65 Destroyers with AESAs minimum and 40-60 frigs. A few 09Vs and all the corvettes with all their ASW.
Land based fires : Thousands of land based BMs as the US decided to get close and many more GLCM. Seeing as they are within the 1IC China doesn't need to use YJ-21s but can use shorter ranged missiles of which stockpiles are larger. The US doesn't nor will even with the Prsm have anything even *close* to this level of land based fire generation capability within land.
Land based sensors : OTH radars and shorter tracks for UASs as opposed to US UASs and a single TACOMAR in Paula much further away with therefore weaker sensor capabilities give China a sensor advantage beyond organic sensor capability of platforms. When you include satellites being focused on west pac the sensor advantage for China is substantial.
Base dispersal : Unlike the US which has its eggs in very few baskets China is much more dispersed across 160-200 + bases. A JASSM that hits a PLA base will have marginal effects compared to a CJ-10 that hits Kadena.
SAMs and IADs : China's coastal SAM and IADs system is extremely extensive and they can retreat back and go their for resupply under lots of safety. US IADs within Japan and Okinawa is nowhere nearly as strong.
In short the balance of fires and sensors in the 1IC by 2030 MASSIVELY favours China. They can rely not just on platforms but a plethora of land based capabilities that will overwhelm the US. If the US does decide to contest within the 1IC their ships will be oversaturated by land ASBMs and air delivered YJ 12s. They will make the kill chain and sensor picture many times easier for China as they will present themselves close to the coast. I therefore believe the US isn't suicidal enough to fight the PLA right off its coast and this doesn't require incredible amounts of CONOPS experience to see.