If you look at a map of China and the Pacific you can see that the “first island chain” of US allies totally surrounds China. From their military and strategic point of view they are being contained.
Now if China were to control the island of Taiwan they would break that containment. It’s very likely they care more about the strategic position rather than whatever it is they say about wanting to reunite with the Taiwanese. They don’t give a shit about the Taiwanese, they just want the island.
Do you go to the cloud district often? Oh what am I talking about, of course you don’t!