Re: Lack of imagination when thinking up things that can go wrong.
RE: Ariane 5 - we used to get the ESA Bulletin at the time. ESA were very heavily plugging 'HOOD' as the answer to everything. What could possibly go wrong?
"HOOD is thus the method of choice for large, long-lived projects where reuse, reliability and maintenability are key issues.
Since 1999, the method is considered stable."