Keith,

While you may be correct about the SubD being easier in poly modelers, the benefits of doing it in MoI would be the accuracy in adding the details after the form is built. Creating details on a SubD cage in poly modelers is a most difficult process at the best (unless you're a true master at polyflow and Sub-D modeling, which in my experience is not that common).

Modo has a set of SubD boolean tools which do help, but I've heard mixed reviews. Trimming door handles, light openings, even body seams is much much easier in a NURBS package.

I will agree Zarkow is also such a master using NURBs in MoI, but once one can arrive at a basic shape, it is much simpler to add the rest of the details. And, from my perspective as one who has used both SubDs and NURBs to model hard surface objects, I find NURBs infinitely easier to use.