The people who style themselves the ROC don't feel that way. They would say that mainland China is occupied by an illegal government. These aren't my opinions,

The people who style themselves the ROC don't feel that way. They would say that mainland China is occupied by an illegal government. These aren't my opinions, these are generally the opinions of the people involved. Which I feel is a fair way to present things. Personally, the PRC has been the de facto government of China for long enough that the ROC loyalists in Taiwan should accept that the war is lost. The big question is to what to do about the island of Taiwan. After the end of WWII, it was surrendered to China. If the Chinese Civil War hadn't resumed, Taiwan would be part of China. But the ROC occupies that territory. And they were the China it was surrendered to. But if we accept that the PRC is China, then we do need to consider their position that by being China, they should be all of China. But sometimes, the resolution of a Civil War is that a nation fractures into multiple. But there isn't a big enough faction on either side of the strait to accept any solution. And even if Taiwan would accept a two state solution, getting China to accept that is a big ask. I think if China ever accepts a two state solution, Taiwan jumps on it. I think even the restorationists in Taiwan would accept that as a way to end the tension.