A.P. Richelieu
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You do realize this facility is expanding over an already existing facility right?
You don't build a full production line unless you have solved all the problems you mentioned in the first place. No one builds a full production line unless you have something that requires a full production line.
New expanded production line = We can mass produce stuff. This is common sense.
In semiconductors You actually do that.
You build the fab in advance and try to plan it to be ready when Your design is ready.
Intel does not design a processor in a new process, and waits until it is fully working
before starting to build the fab.
Sometime you build a fab, but only populate it partly,
simply because your existing fabs are not good enough for next process.
You cannot even experiment in the old fab.
There are plenty of examples where a semiconductor device has been in production for years,
and suddenly the yield drops to nothing.
Semiconductors is unlike most business. You can never guarantee any output.