And then there's also the vibration issue. I don't think most medical devices need to stand up to continuous vibrations like you'd have in an auto engine. If they are not soldered well, eventually things can loosen up and fall off, or minimally just break contact. I think the car industry is closer to the aero/space industry than medical industry.
It took 20 years but the circuitboard on my Nissan's dash had deteriorated enough to warrant resoldering. Now that is done, it is as good as new. It's remarkable how dash clusters look inside, absolutely pristine behind the plastic lens in spite of their environment.
Aero has a few unique issues that make car parts unusable. One is the lower bound of the temperature range, it's not unusual to see -55 celcius for an aircraft. And pressure, air is really thin at the 41,000ft most large aircraft are certified for.
