When working in the technical field it is also very important to be able to master the construction of non-existent objects to present the novelty to the web public as fast as possible.
The image of a product-to-be is necessary too, crucial sometimes, hence the construction/re-construction, reverse technology of objects and successive rendering.
If a photograph is worth a 1000 words, a 3D rendering may be worth a 1000 photographs, since certain details may be enhanced, details may be presented in a different way, some information may be hidden if necessary, and objects can be visualized from all sides.
Lots of action here. Having a picture taken would have been a lot of work, and it never becomes that clean looking, anyway