There's also the brain drain aspect. All the process engineers and techs that understood all the various "recipes", quirks, etc, of the various machines moved

There's also the brain drain aspect. All the process engineers and techs that understood all the various "recipes", quirks, etc, of the various machines moved on to other work. A new crew will eventually work it out, but there's a lot of trial and error getting to the right bake time/temps, spin rpm, etc, etc. Yield and rework suffers while they do that.