PLA units involved across the LAC aren't the ones who'd feature in amphibious assault across the Straits of Formosa . Both are different & highly specialised activities. Ditto for the PLAAF units .
The reason I believe ( and it's purely my gut instincts here , nothing to be gleaned from the net ) China'd come for us us before they initiate Taiwan is they'd expect a swift short "shock & awe" campaign to test the efficacy of their other arms namely the Rocket Force , Cyber Security Force , their Support Forces which handles logistics , their ISR network , etc .
A quick win here would not only boost their confidence but also validate the soundness of their systems & strategy before taking on what should be their biggest challenge namely the US & it's allies along with Taiwan.
The danger here is things don't go as per plan & they then get stuck in a war of attrition. That's when their desperation will come to the fore & you can expect them to then throw everything thing into it including the proverbial kitchen sink.
The more the conflict drags on the more their desperation increases leading them to push the envelope drastically. This would probably see us become pretty desperate as well. At this point all bets would be off.
The operating logic being if the Chinese armed forces can't overcome India , what're their chances against not only the most powerful country on the face of the earth but also their allies who've formidable militaries of their own namely - Japan & RoK .
Remember Xi & his clique have made a lot of enemies back home who're just waiting to see him fail . A war , any war China initiates would jeopardize trade & with it their incomes. The moment he does fail or even is perceived to fail like for instance that's how a stalemate across the LAC would be seen , the daggers would be out.
Hence as you see there's a lot at stake personally for Xi in this one much as Munir Maamu is discovering now on a much smaller scale.
Could go on but trust you get the drift.