[aerohead]

It would be the images never published which would be of greatest value.
If the aerodynamicist is locked into a 'hard styling' protocol,where the finished body must very much resemble what the stylist signed his name to,then the smoke can reveal 'optimization' potential as was done with hundreds of cars now.
A full-scale clay can be altered by master clay modellers right in the wind tunnel and sequential runs made to evaluate any progress.They'll literally camp out at the tunnel,running 24-hours a day until they dial in a shape.
Scale models and CFD aren't able to allow such alteration and evaluation.
Lee Iacocca said that many Chrysler products were saved this way.
What we're allowed are centerline flow images of dubious value.But hey,in the immortal words of Bob Parsons,"they're way out ahead of nothing."