This is very interesting, there is definitely a big opportunity for CAD software that does things differently. A lot of the supposedly 'BIM enabled' and 'parametric' CAD software in use in the construction industry suffers from over defined and inflexible representations of real world objects, which often fail in the edge cases. I don't think software should be defining what it thinks a wall or a slab is or how they connect to each other, I think they should be giving architects and engineers better tools for defining and categorising these things ourselves.