I think it's simpler than that. Semiconductor manufacturing is such an advanced field, and there are so few openings for engineers, that they can be very select

I think it's simpler than that. Semiconductor manufacturing is such an advanced field, and there are so few openings for engineers, that they can be very selective in who they hire. We don't need to conclude that semiconductor engineering is particularly difficult, it's sufficient to conclude that they are simply picking people who will work lots of unpaid overtime, simply for the thrill of working in such a cutting-edge field.