The thing about that is when those rebels have held the territory for nearly a lifespan, gotten international recognition and diplomacy, built one of the strongest militaries and armies in the world, and quite frankly it’s unthinkable to imagine a situation in which they lose the mainland without a world war level conflict then they’re just like a country. It doesn’t matter that neither is willing to cede the other’s existence. The ROC can be the ROC all it wants, but from an international perspective the country that has the most claim to mainland China is the People’s Republic of China. Both are runner up in claim to the territory the other holds, but boots on either’s ground is closer to a cascade to worldwide MAD than anybody seems comfortable with.

Maybe I’m wrong but I’ve always figured taiwanian independence not to mean a name change but a mutual agreement of the other’s sovereignty over the territory they each hold and have for decades. Or in practical terms, the ROC admits it isn’t getting Beijing back and the PRC agrees to not try to conquer the island of Taiwan. Really calling it this and not a Chinese peace treaty is mostly just an acknowledgement of how ludicrously lopsided this conflict is without international support for the ROC