I don’t think that this is so much of the problem - you can do a huge amount of stuff with NURBS - but rather Rhino’s current interface that is now holding it back IMO. At the beginning of this video posted in another topic, we see the kind of user interactivity and real-time preview that I always thought Rhino should have for things like extrusions, etc… Unfortunately, it simply has not evolved much over the years, in contrast to other programs.
–Mitch