It could be the case that they become the hegemon and don't ever conquer anyone besides Taiwan and it still sucks due to how they treat ~20% of the Earth's popu

It could be the case that they become the hegemon and don't ever conquer anyone besides Taiwan and it still sucks due to how they treat ~20% of the Earth's population (their own citizens). A liberal, democratic China becoming the hegemon is very possibly better than the status quo (especially under Trump and with the surge of far-right mainstreaming in the US), but China as it is now cannot be trusted to be a good steward of a hypothetical Pax Sinica, just as Trumpist America cannot be trusted.