By the power of Fourier, I summon thee!

You are missing the point. Open source hardware is about the design and drivers for the hardware being open. This means that when you buy a component you get full specs and the source code to make it run. That way you are not ruining windows 3.1 in 2024 because the company that created your train software does not update it and you can’t legally replace it (this is true right now).