Taiwan is subject to the same equipment dependencies as China. They don’t make the machines, they import them from the Americans, Dutch, and Germans. If China took over Taiwan, they might be able to obtain Salem great semiconductor engineers (but they could just hire them already on work visas), maybe some plans for the next 2 or 3 years on chips they can’t fab without western equipment, but that’s it. Economically, they would gain just land and any people that survive the invasion.