Apart from most products beeing designed by CAD (Computer aided design) anyway,
there are two more main advantages to 3d for industry.
The first beeing presentation and explanation.
Making a movie of a working machine maybe fine but it will never be possible to look within the process.
3d gives that possibility and is able to reduce detailing to the essentials,
making complex processes
easely understandable and show parts of the machine that a camera would never reach.
Example: An animation of a large textile machine (Weftdryer) showing how the sensors work within the machine.
It was shown on exhibits wordwide, safed the Company transport of a lot of hardware and got good critics.