[Andy A.]

If an engineering company that produces or deals with three dimensional objects is using AutoCAD to the exclusion of a 3d parametric software package, like Inventor or Solidworks, it isn't because AutoCAD is better.

It's because the company is made up of people who don't know how and don't want to learn how, to use Inventor or it's contemporaries. AutoCAD has a lot of institutional momentum behind it, but that doesn't mean that it is better. It's just all some companies know.

-Andy A.