Maybe this test flight would have been a more realistic simulation if, on shutting down No 2, they had then cut the engine restart circuitry with the pliers!
Then they would really know how it felt to be dependent on just one engine operating flat out for more than half a working day, that if that faltered in the next 5.5 hours they were finished. And let's fit engines at the end of their overhaul life while we are at it, and instead of Boeing's top test pilots get a couple of crew from an agency.
Oh, and they should all have their wives and kids in the back too.