I have. Several -- US, China, SKR, Taiwan, and Isr. All semicon.
But that is not the point, which is that mid level technicians and engineers can bring up a fab with production workers knowing nothing more than how to use Windows. How the hell do you think your China got started in the past that allowed you to talk nonsensical today?
Wrong. If Mexico and Vietnam can assemble cars, they can run a wafer fab. But never mind wafer processing. Both Mexico and Viet Nam can be Assembly and Test sites, meaning they can extract the dies from the wafers, package the dies according to customers specs, and perform functional test of these packaged dies before shipping to customers.
So yes, your China is very much threatened and the Chinese goobermint knows it.
assembly and test are already dominated by mainland China and Taiwan. You know as well as I do that multinationals are extremely risk averse and will rarely switch from proven suppliers to unknown ones. Even for process supplies like chemicals, getting a company to switch from say, Entegris to Gelest, is very hard, and that's for essentially interchangable bulk commodities, not really specialized services.
speaking of process supplies, where are all the supplies going to be sourced from? Are there any chemical companies capable of the specifications that semicon requires in Mexico or Vietnam? What about machinery? Is there an Applied Materials facility in Mexico or Vietnam? There's 17 in China. No, you have to ship EVERYTHING in.
What if they need ultrapure cleaning? Is there a QuantumClean equivalent in Mexico or Vietnam? Ferrotec has a cleaning facility in China, so does CTG. When chamber maintenance need to be done, where do they go? They have to ship it elsewhere - China, US or South Korea.
At that point what's the point of building in Mexico or Vietnam? You have more lead time for supplies and machinery, you have to fly people in to get maintenance, you have no local customers so your only business is export, at a time where export markets have already been cornered. So the only possible reason is cheap labor, cheap land, low taxes. CHEAP and LOW means no value capture.
the other thing is that Mexico and Vietnam won't own any of the IP. As an example, BOE owns its own fabs, is there a wholy owned Mexican or Vietnamese fab? Is there a Mexican or Vietnamese SMIC? No, they need foreign owners who take all the profits, leaving crumbs for the local workers.
so even if Mexico or Vietnam somehow succeeds in attracting multinationals, which they can't because they don't have the ecosystem, they STILL don't have their own IP. they'll still be making crumbs compared to Chinese companies that have their own IP, never mind Western companies which command even higher profits.