Makes a lot of sense. They will put together a line using one of a kind of each tool and verify they can manufacture with a similar yield and performance. That way they have a reference for the new fab. Otherwise a way more complex debugging challenge. They have all the engineers there to figure out the mini line.TSMC is rumored to have plans to import parts of a fab to Arizona to save some money.
TSMC Plans to Partly Build U.S. Fab in Taiwan: Report : Read more