I've never done CAD, but I did try 3D modeling and animation in my teens.
I was not any good at it.
I did slowly improve, but never got to where I could make anything genuinely visually compelling.
I got to be okay at working in traditional 2D media, as long as I was working from a reference photo.
I've dabbled a bit with that kind of work and I find my mind's eye to be critical for it and I would have no idea how to undertake it if I couldn't visualize something.