On the subject of real cars, vs made up cars in a sim like AC, for me the biggest problem with real cars is that we can adjust our steering settings so much. Different steering wheels feel different, with different maximum rotation and different force-feedback settings. You could have a car which has horrid vague over-assisted steering in real-life that feels the same as any lightweight sports car with a quick rack and no power assistance.
I say that's a problem, it's not so much a problem as it is something that devalues the joy of a great car. If you can't go from an e90 to an e30 m3 and appreciate the steering feel then that makes me ask, what's the point?
You can get suspension, weight distribution and geometry perfect, and a perfect 3d model, but if when you drive it you know that you and everyone else will just have the steering the way they like it, then it's all a bit meaningless. Not to mention brakes with very different pedal feel, throttle pedals with different travel, clutches and gearboxes that feel unique. When you switch from one real car to another there is so much besides on the limit balance and outright grip that contributes towards "handling".
So for me I feel like they might as well not be pretending to offer what is basically impossible. At the end of it all they're just paying for the shape and name. Specifications can be replicated and with great physics underneath the end result can be just as involving, rewarding and impressive. With rubbish physics underneath it doesn't matter how much you spend making it look, read or sound like the real car. Sounds can be good or bad whether they're sampled or not.
That's why I find it hard to get excited about a specific "real car" in a simulation any more than I am about the configuration and specification of that real car.
I also don't get multi-car class racing in simulations either. In real-life it's a means to an end, but in sim racing it just means there is performance disparity when there's no point.
If AC take the specs verbatim there will be a faster car in a class, and because it's real they'll have to decide whether to change it or not (if it's fictional they wouldn't have to decide). It's not a competition of car vs car or manufacturer vs manufacturer, in a simulation racing environment, it's driver vs driver. There is no need for different cars, no audience to entertain, no budget constraints or logistic concerns, no publicity benefits.
Anyway, rant over, I know a lot of people like to see different shape cars next to them (although I doubt they enjoy it if that car is faster).