When considering airborne landings of a few hundred men, you should also consider the possibility of local agents joining them. The MSS probably has more than a few hundred spies on the island, in particular in the military. In addition to that there are millions of mainland tourists coming every year pre pandemic. In anticipation of a war, you could easily send in a few hundred people as tourists that then hide somewhere.
We're not talking about attacking a foreign state. This is a civil war. Of course China also needs to be ready for sabotage and terrorist acts by separatists and ROC agents.
On the same wavelengths my friend...
It's time to open up The Second Front.
Instead of looking at the Taiwan Issue in this binary symmetric way "Force on Force" , The PLA vs the separatist forces("ROC") supported by their handlers(US). I am saying(suggesting) there's another option on the table for the PRC/PLA to consider...
Proxy , The Second Front. The creation of an of irregular(paramilitary) force of Island Born Compatriots who will wage in guerrilla warfare on the Island against the non compatriot forces("ROC") on the behalf of the PRC/PLA...The PLFT ( "People's Liberation Front Of Taiwan" )
The PLFT would provide the PRC/PLA "political cover" , leverage (both militarily/politically) over the separatist. It would allow the PLA to engage/wage a war of attrition against the foreign backed separatist forces indirectly , While it's mainland Forces are kept in reverse(on the sidelines) until the optimal time to permanently retake the Island directly presents itself.
The PLFT mission(goal) would Not be to defeat the separatist forces("ROC") out right. It's sole mission is to wage a slow campaign to drain(tax) , to apply stress/pressure onto the "ROC" by Destabilizing the Security Environment. The PLFT would assist the MSS on the Island. The PLFT would be task with garnering continue support (by enlisting more compatriots on the Island to the cause) , making preparation (laying the ground) , carrying out Raids , Ambushes , Sabotage , Espionage and Assassinations. The PLFT would Not have to be a large force , it could easily accomplish these objectives with operatives operating in cells/teams spread across the Island.
The "ROC" forces would now be forced contend with an internal threat while at the same time face/off with the external threat in the PLA lurking on the horizon biding it's time to strike.
"do onto others as others do unto you"
The US is practically following the same strategy of arming(selling arms) to the non compatriots on the Island as their proxy to fight the PLA on their behalf.
how does one kill a porcupine ("ROC") inject it with a virus (PLFT)
The US track record in fighting in long , prolonged conflicts is sketchy. Especially ones that involve guerrilla insurgencies.
I say it's time to flip the script , turn the tables onto them (fight fire with fire). Take the initiative.