Hi andrew, from what I can tell there from your example that the Modo "CAD loader" generated, they really shouldn't be claiming that it actually generates quad - n-gon meshes if that's the result that they actually make.

It really looks to me like they just are taking a triangle mesh that was initially generated by the Parasolid kernel and then just trying to glue those triangles together into n-gons and that makes a kind of chaotic looking n-gon result and can still leave a lot of triangles at the end as well.

- Michael