I think you’re missing their point, they weren’t saying that Blender is cad, it’s just a good comparison, as a successful piece of software in the the same broad, general category (3D modeling)
We want what Blender is to mesh modeling, rendering, etc, but for parametric cad, manufacturing, etc. Basically Fusion 360 but open source, without any of Autodesk’s bs. Ideally it would even work together with Blender for rendering.
Connect them together for efficiency, and maybe use both rails for stability and to reduce design conplexity. (you dont even need any additional infrastructure!) Also, have them arrive regularly, so that users don’t need to bother with an app! Brilliant!
Seriously though, it’s really amazing how people keep inventing trains but worse. I guess this idea makes some sense if there aren’t enough riders for regular train service, but still…