Holding static positions = dead from strategic bombing once PLAAF destroys the ROCAF within day 1.
You have to understand that the ROC military isn't going for an Iraqi insurgency or Swiss strategy where they bog the other side down in urban warfare. Their procurement patterns are for "offshore engagement". Basically, they want ROCAF and ROCN to attack the PLAAF and PLAN before they can establish a beachhead. This is, as you may guess, insane of them, because in a large scale fleet action or air war... PLAAF and PLAN are going to smash them.
But see, this is what the KMT does. They did it once before:
https://en.wikipedia.org/wiki/Battle_of_Shanghai
In the Battle of Shanghai Chiang Kai Shek sent elite German equipped divisions against the Japanese in what they wanted to be a showdown battle to smash the Japanese army.
Yes, it was a fantasy. Yes, it resulted in Chiang Kai Shek losing all his elite divisons. No, it did not result in defeat of China - but solely because China was big. Taiwan isn't so big.