You assume that none of those armed drones and choppers won't fail in their task.
What if all of those assets are shot down before they managed to inflict enough casualties? What happens then when landing party arrives at heavily defended shore? They either have to land against heavily defended beaches or risk another dangerous trip back to mainland white getting shot at. Russians had similar fantasies about Ukrainians simply giving up but we've seen how thats going.
PLA has higher accuracy satellite guidance than USA GPS has (which is definitely way better than what Russia has), and more than enough rocket artillery to be guided by said system. Any "heavily defended" i.e. has many rebel troops near it location will just become a charnel house for air and artillery, no matter if they are rebel or US troops, since organic artillery support on the same scale will be impossible for US to move into Taiwan, since unlike Russia and LDPR, USA doesn't share a land border with ROC.
Chinese soldiers aren't like Russian soldiers trying to invade a country while their leadership doesn't declare open war. They're fighting for their existence and freedom as a country from American invasion, just like the most fanatic Ukraine soldiers fighting against Russian invasion. Americans are the ones who are under a fantasy, thinking they can borrow the RU playbook and play up Chinese separatism then send troops to support the "independent republic(s)".
If a corrupt dysfunctional oligarchy in Ukraine can fight so fiercely against such an invasion, you'll see what happens when NATO pokes the largest economy in the world with over 10x as large population as Ukraine and an army far more modern and ready to defend the homeland at any cost.