Taiwan is well-armed and strong. But without US help will they really fight China? That’s a very tough war to win. I think that without our help, Taiwan will decide to avoid devastation and surrender somewhat quickly.
Taiwan is 20 times larger than Okinawa, with a much greater population.
Once China invades Taiwan, we’ll do nothing. The USA of 2021 is in no way going to gear up for Okinawa X 20 to eject the ChiComs.
Plus, our USN warships will be in Chinese conventional missile range long before they approach Taiwan. This will not be a case, as with Okinawa, of anchoring offshore and sending in Marines and soldiers.
Once China invades Taiwan, it’s a done deal, over.
I think there will be a series of sharp air & naval battles where Taiwan’s forces will be ground down at which point Taiwan will surrender relatively intact.