I just fundamentally don't understand the idea that nobody's allowed to restrict firearms manufacturing unless they can solve complex riddles about the nature of parts. I understand that you perceive this to be a deep and interesting point, but to me it seems enragingly obtuse. Let's start with blacklisting DefCAD and iterate from there, what's wrong with that?

Like, it's true that refrigerators don't maintain a completely uniform temperature, meaning there's some philosophical wiggle room in what it means for a health department to say that raw meat must be stored at 41F. But it would be absurd for a meatpacker to declare that this means food safety is "impossible", and outrageous for them to conclude that they're just not going to bother refrigerating their meat at all.