I think ACC is to only provide GT3 cars, so not even GT2 ...
AC is great, but is clearly disturbing me aswell on many aspects ... This is why I am still and will remain focused on LFS : developers may not be very quick to provide plenty of things compared to some other game companies, but in the end you get something at a very high quality level, speaking about how are implemented all the features. And this is priceless (and even cheaper than other simulations)