by a Technical Illustration, do you mean a drawing as part of a printed manual? Inventor is very good at producing technical illustrations. I think the biggest problem that has been addressed on this forum is integration with word processing programs. The problem there is having an easily updateable document that stays in sync with the design, has appropriate printing resolution, and can be labeled to make a list of illustrations for the document table of contents.
In the "real" world, I don't know how much this is actually done compared to design documentation. We don't do any documentation outside Inventor, but for our needs there is relatively little writing compared to drawing and annotation.
