I get the impression that Jeff Rowe thinks this study is about engineers strugling with 3Dfiles from foreign systems. In fact the study points out that its even as much strugle on naitive modells.
This points out the drawbacks of constraints driven 3D-CADsystems.
Those systems wants you to figure out in the begining when you start to modell, hove you want to change you modell at a later time. This is called "Design Intent".