I don't think that aero is not a spec part. Look at new cars - all the vents and their location are almost the same. And the shape of the car is almost the same. Not mentioning spec splitter, diffuser and wing.
I think most of cash flows into weight-fight. I've read RE where they say that DTM wanted to use more details from road-going cars but in that case they've got some 100 or 200 kg over the limit, so they had to use some expensive lightweight details.
As for personalities I totally agree. Today DTM cars are not interesting from engineering point of view. They are almost spec-cars. So, in the future World championship for drivers can be organized on the base of DTM, American DTM and Super GT, as cars are almost the same. And it would be a way more fair than F1.
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