Earlier quoted context omitted.
CAD on Mac is pretty much non-existent, as is any professional 3D market - the market share isn't there, the hardware support is terrible, so few major players bother with supporting Macs. All this stuff is either Windows (CAD) or Linux (3D simulation, visualization) these days. And with this deprecation Mac is pretty much dead as a platform for professional 3D.
Creative Suite has run better on PC and at better price-performance ratio for almost a decade. Graphic Designers still like Macs for the most part I guess -- and I still see them in video production a lot, but that's starting to change pretty quickly.
I think the Final Cut "Pro" X was the inflection point - the change is ongoing.