No.  Better rendering and rendering speed.  Improved materials and skies (and better editors for them.)

There are plenty of modeling programs out there, some free, like Blender and Wings3D, and some relatively inexpensive, like Silo, that can do the job.

It would be like comparing Vue's post processing to Photoshop.  I feel Bryce should be the second-to-last  or last (without post processing) phase of a rendered 3D project.

Take Carrera and Vue.  Both have modeling capabilities, but neither are mentioned very often as modeling applications.  Sure, if you want, you can create great looking models using those applications (including Bryce), but the time it takes compared to a dedicated modeling program doesn't make sense.

Just my opinion here and I'm sure there are others that would like an "all-in-one" application.  But a shovel, rake, and hoe make sense too.