I work for a medical device manufacturer and you are missing a important reason for that exception. Yes human lives are on the line. In addition WE (meaning my company) are responsible for finding out why it broke and how we will prevent other devices we make from breaking.

We make a device and say it will last 10 years, 2 years later it stops. We have to replace it, We have to investigate to the best of our ability, We have to report our findings to the government, if several cases happen We need to come up with a prevention for the future dailures(or prevention if severe enough). We have entire departments for this. It is our burden not the consumer and it's our burden so we have enough evidence to determine root cause and final solution so we can prevent further failures.