That section reads like a Bad Advice column for software testing in general. "Ehh, don't bother with end to end testing -- testing each part in isolation will be fine."
Maybe fine for an e-commerce site or game, where the stakes are measured mainly in lost revenue/customers and a team of engineers burning the midnight oil to sort the problem. Not so fine for spaceflight.
Maybe fine for an e-commerce site or game, where the stakes are measured mainly in lost revenue/customers and a team of engineers burning the midnight oil to sort the problem. Not so fine for spaceflight.