It appears to be built specifically for designing electronics enclosures with 3D printing in mind. I'm sure it's a great utility, and I don't mean to argue to no end, but to me a tool built specifically for 3D printed design would have core functionality which offers layer line alignment and orientation, custom and customizable internal structure (what we call "fill"), and a parametric engine to adjust the design and internal structure based on layer and nozzle thickness. While these are all currently slicer-like functions, slicers are absolute trash at being able to customize a part for strength, stiffness, and failure mode selection. (Yes, I'm a structural engineer - I actually do know about these things and design for them - usually being at odds with the slicer over just such effects)

Anyway - I'm sure Dune3D comes in handy for its designer's purpose, and I'll probably file this for the next time I think about fighting a Pi case in CAD.