The Taiwanese public sentiment literally doesn't factor into this. Do you think the laypeople want to be the sacrificial lambs to contain China? Fuck no. Does the DPP care? Also fuck no. And so Taiwan is being set up as a forward fire base to inflict as much damage on China as possible before they're inevitably bombed back to the Stone Age.That's why China is developing air and missile defense. Having a very strong missile defense is extremely important these days from a war survival perspective.
China cannot obviously destroy all of Taiwan's capabilities and some will be buried under ground. But the goal is to slowly bleed Taiwan and sap the morale of the Taiwanese.
Just look at how Iranians are revolting for Israel and US who literally killed them recently. They have been defeated mentally to the point that they are agitating for surrender and subjugation.
This is what China needs to against Taiwan. Pressure them so much that they mentally break and ask for reunification.
Your strategy of prolonged pressure doesn't work if the enemy ruling class has been compromised and are willing to sacrifice their people as proxies. Attrition and prolonged suppression don't matter if the US-DPP full-send everything they have in a single salvo with no regard for the retaliation because the decisionmakers can flee the consequences of their choices. What would need to be done is a massive decapitation strike to effectively neuter Taiwan's ability to threaten China before this salvo can be coordinated. That means a surprise and comprehensive flattening of Taiwan that would make Curtis LeMay green with envy.