So what’s the point of engineered or technical drawings then? If you make the drawings on a CAD program, you can use them for dimensional insight, into the model. You can “check” the model by looking over the drawing. If you find a problem, you can go back into the model, make your changes, then reboot the drawing and the changes are reflected in the drawing.
In CAD, you have what’s called, “part interference”. It checks for interference between parts during motion. But technical drawings are a way to look at the 3D model through dimensions. Sometimes, dimensions can bring you back to reality. If you used this method before there was CAD, then it makes more sense and it helps. Otherwise, there are generators in the CAD software that help with diagnosis of assemblies such as stress testing and dynamic simulation, just to name two.
Another, off the subject use for technical drawings is that they look great for posters and flyers. I know, I know. I like ’em though. You can make some really cool views. You can change the materials of your model to give the model a new appearance. Some parts can be shifted to transparencies, sectioned views and the list goes on.
So, in summary, technical drawings and CAD files each have their own unique uses and one couldn’t replace the other. Then, different from both the CAD file and the technical drawing is, of course, the patent drawing.