Both governments consider themselves the legitimate governments of China, which includes Taiwan. Wanting to become an independent country entirely is a minority opinion in Taiwan. As such, the PRC as a sovereign nation of course will reserve the right to retake its own territory by force. It isn’t at all surprising that they haven’t taken more direct millitant action against Taiwan, though, for precisely the reasons I have said: they are willing to wait until Taiwan chooses to reunify. They gain nothing by striking Taiwan to take it by force, when they can just maintain the status quo until it works out in their favor.

The reason it’s surprising to you is that you have the assumption that the PRC feels compelled to strike. This is something constantly fearmongered about by the west, but doesn’t actually hold water. By all measures, events seem to be moving in the exact direction the PRC predicts they will, which would make it a mistake to strike Taiwan.