One thing that probably won't change is the need for things which we design to be made of multiple parts which must be assembled together. For any serious appli

One thing that probably won't change is the need for things which we design to be made of multiple parts which must be assembled together. For any serious application this requires specifying geometric dimensioning and tolerancing information, which ideally should be tied to the topological entities in question. I'd argue that this information is becoming even more important with the rise of 3d printing and other digital manufacturing tools. If this information can be included in the CAD data, the manufacturing tool might automatically determine how best to manufacture the part to meet the required tolerances. Topological information is also useful for analysis. We may wish to apply a load or boundary condition only on a face.