There is a progression in “tightness” that goes through the design process. Maximum flexibility at the initial stage, maximum definition as it is complete goes to manufacturing.
Keyshot renders are crystal clear and defined, the viewer accepts them as finished work, discussion become very channeled and specific. If there is still room for play in the exploration, it is better to A), not have to model every detail, and B), fuzz up or obscure certain finishing details to allow the design to breathe.
My own process has grown to rough model in 3D and render and then use hand over work for presentations. I need all parties to understand that there is both room for evolution, and that the design is not finished and ready to hand to tooling.