PRC-ROC is unfinished civil war with a literal countdown timer (2049). Reality is reunification with Taiwan is the ultimate political get-out-jail-free card for any Chinese leadership. It doesn't matter if PRC is democratic or authoritarian, taking Taiwan will supersede and overshadow any large domestic issue that could undermine legitimacy. And PRC will face many in the coming years. If she successfully negotiates them, then missing the 2049 deadline itself will be overwhelming issue determining legitimacy. PRC moving on Taiwan is inevitable, even the mildest forceful reunion option (quarantine) could lead to total-war because that's just how escalation spirals.