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.
Points for zombies:
The isolation and dread caused by the entire world turning into flesh hungry monsters, including family and friends
The body horror of being bit and inevitably losing control of your mind and having your body decay (also you can perhaps hide your infection from the rest of the group?)
There are always more, they never stop. Basically turning human persistance hunting against ourselves
Also they just make a good excuse for an apocalypse, with humanoid things to shoot