Well, in this case the proof is there for your perusal: it works. They have ironed out most if not all of the kinks and manufacturers are pissed that they got shown up by a bunch of people who they consider to be subjects, not having agency. Because after all, if a bunch of ordinary but skilled people can do this their justification for obscene pricing all but evaporates.

I look at these companies for a living. Every two weeks on average another one. I see their codebases. I interview their engineers. There is no magic sauce. It is rare that you come across a company that really gets engineering and that doesn't see the product as a minor obstacle on the way to profits. Medical device companies in general are not exceptional in this sense (though I am aware of one that is).

But fine, you think that the people that work for these companies are somehow better than that ones whose lives are at stake. I beg to differ.