IDK, You are correct in the case that US is pushing CIA Backed Taiwan indepentists and other countries politicians stooges as proxies for a regional conflict with China with the intention destabilizing the entire region. If the situation reach that point China would had no other option than going full force against these stooges. In that case Taiwan as the battlefield is likely to be decimated with no hope to ever recover. That is disruptive.1. You said it's the best deal that satisfies both sides; that does not satisfy me as a Chinese and I don't see that as a good deal. If they agree to the 1 country 2 systems, they do so because they are out of options, not because they are enticed. They will just as begrudgingly accept rule by Fujian province.
2. Hanjian activity and thought need to be disrupted. Surgery is more disruptive than a cast but it solves problems that a cast cannot.
The other scenario is a shift on the support in the Island to put an end to the civil war in negotiated way toward some sort permanent unification. Lot US stooges and other delusional stooges don't like the idea, their goal is a proxy war, but the reality of a protracted conflict will get clearer by the day.