Showed you an example of good damage model on road cars
And? Re-read my post, I never said we can't see good damage modelling on road cars, I said the reason we don't see extreme damage modelling on road cars, certainly not consistenly at least, is due to licensing.
Car manufacturers have a right and control over how thier property is treated in a video game, this is why some manufacturers decide from time to time they don't want their cars to appear in street racing games entirely.
You are at the mercy of what the car manufacturers will allow you to do, if you have a small number of cars you might find more wiggle room because you are negotiating with fewer parties. A trend is that cars in current production are the ones manufacturers are most protective over and there are marketing reasons behind all of that.
Developers have to choose how to implement damge in thier game and if they want it to be consistent or not. For example say you design a game that features TVR's and Porches racing each other, TVR say "do what you want to our cars" but Porsche say "scratches and minor dents only" (this is just as an example) as a game developer you then have two choices, do you allow the TVR's to get broken apart but just scratches and minor dents on the Porches or do you restrict the TVR's to just scratches and minor dents too?
Decisions like this are why getting a consistently complex and detailed visual damage model in a game featuring road cars is extremely difficult.
While you can get a good damage model in if you negotiate it well enough, the games with the best visual damage focus on either only racing cars or fictional cars, that's excluding games with inconsistent damage models where certain cars get damanged noticably more than others. Cases in point would be Bean NG Drive, Wreckfest, Dirt Rally etc.They all provide consistently high if not extreme damage across all of thier cars but do not feature licensed road cars.
I think some people just think it's entirely up to the developers what goes into the game and what doesn't and why the cars don't disintegrate when they impact a wall head on at 200mph.