Why do you think a random person, who is VERY passionate about something, as to invest all the free hours in life to do something, is less skilled that one who just does it because is needed to survive?

Sorry. I would be much more inclined to have something made by somebody passionate about it, as done by some guy that received hopefully some kind of instruction on how to do things and was then left alone.

In this context (GA) we are not comparing Airbus/Boeing with a garage build. We are comparing some small company making 2 seaters with your hangar and maybe 10 certified aircraft mechanics that will help you a lot on the process.

And why do you think pathos arguments are logical? Granted, they didn't cite them, but assuming it is true, empirical studies showing the accident rates are the logical point from which to draw conclusions. What you would like, how you and others feel about it, and what you would expect are meaningless.

You're also equivocating. They made it extremely clear they are referring to hobbyist and other such groups with vague or unknown qualifications; whereas, you go in and make stipulated claims about small businesses with certified mechanics, etc. These two are clearly not the same category, making your argument non-responsive. It's also contradictory in terms of discussed liabilities and such, as the small company, and its mechanics, that whoever worked with, would have liability as well, as opposed to the "random git repo".

See my other follow up comment ("same model"). Medical device software development feels much closer to homegrown (or worse) than aeronautical engineering.

You write that as if you have ample experience with codebases of medical devices and I'm going to take a stab at this and say that you don't. Prove me wrong.