Yes, I am aware of China's short comings; their jet engines are shit, this is known.
There is a reason my doubts center on sea power, not air power.
Also, I'm not sold on our warhead production capabilities after learning about the FOGxLIGHT fuck up and the issues it highlighted. The DoE's internal classification system and issues with personnel familiar with thing retiring or dying without passing on critical knowledge is a real issue forcing us to reverse engineer some of our own shit.
As for tunnels...we have hardened underground bits of major bases (and things like Cheyenne Mountain); China has literally built thousands of miles of interconnected tunnels over massive parts of it's interior that go between bases, silo's, and other bits. The even call it thier new Great Wall.
Now unless one of my vet friends from my legal weed trimming days is actually right about the rumors of massive secret railways and tunnels crisscrossing the US and kept hidden from the public, which I doubt due to how hard it is to hide that shit from seismic sensors and gov funding watchdogs if it really is to that scale, then we don't have anything truly comparable.
However I was not aware of continuing and active large scale protests in China, outside the shit in Hong Kong.
And you are right we aren't in it alone, but neither is China. The already have a defense pact with Iran, effectively own Pakistan and NK, and I would not count out Russia possibly siding with them in a fight (or just making a move on the Baltics to drain US forces via another front).
That's not even counting the CCP agents in our gov and how they are very likely to make sure there is no war with China, or nothing beyond possible SCS/Taiwan Straight skirmishes at most.
The way the variables seemed stacked, based on what's available to the public, and the way things are going politically on the domestic and international scene...not encouraging it the nicest way I can put it.