That's the point. Google and the rest of the big 4 don't need ordinary plumbers, they need process engineers (the engineers who design the piping at oil refine

That's the point. Google and the rest of the big 4 don't need ordinary plumbers, they need process engineers (the engineers who design the piping at oil refineries and chemical plants) because they are tackling problems that nobody has done ten times, let alone "ten thousand times".