The final image is shaped by a variety of people observing live changes to the scene and giving inputs. You can't iterate as quickly when you're interrupted constantly by the artist having to modify the scene and then render it. I'm sure you would have made a nice looking image using a digital scene, but I don't think you can duplicate the experience. It would not have been the same creative atmosphere.
I'm pretty sure it'd be far faster for a team of people to view various options on a screen while an artist moved virtual lights around and played with colors and lens flair effects in a computer than it would be to wait around while people set up and move around various lasers and projectors and smoke machines between attempts and then looked at a screen to see how the camera picked it up.
