Generative concepting means using image and 3D models to produce many early product concepts from a brief, then sorting them against the constraints that will matter later, so a design team explores widely without wasting a week on forms that cannot be made.
The image tools are already good. Midjourney, Stable Diffusion and Vizcom will turn a sketch into a convincing render in seconds. What they do not do is remember that the product must fit a 90 mm envelope, ship in two injection-moulded halves and look like the rest of your range. Those constraints live in the brief and in the heads of the senior designers, and the concepts drift away from them within an afternoon.
So the work is mostly around the generator rather than inside it: a reference set drawn from your own archive and brand book, a brief written as explicit constraints, and a sorting step that reads every concept against them and says which ones survive and why.