I'm not an auto mechanic or designer, but off the top of my head I can name a few critical systems that could fail on 280 at 70 mph with disastrous consequences. I still drive. I ride a bicycle, but I can't really say I trust those little spokes. Enter then the good people who must actually negotiate the contract. Usually, that means least cost, or best bargain.
Reliability is addressed in terms of guaranteed response times to failures.
Network interface is often left as an exercise for the buyer. In most cases, those 10 pages now number over 100. And the rewrite usually takes 6 months or more. And the process then exceeds a year, including rewrites. One good friend, Harry Parode, says that we only strive to spend public funds honestly.