The way a car looks is just as important as how it feels when you're making a simulation, when achieving photorealism as well as physical realism is the primary goal. My my, you apologists really need to wake up. Name one other game that has done what GT6 and GT5 have done with respect to a profound generational gap in car quality. There's a reason developers don't do this.
Look at the ridiculous level of detail PD has put into premium cars, the way they tout the advancements they've made with regards to HDR lighting and adaptive tessellation, and the consistent inclusion of a photo mode in the last three games in the series. You really think "being a car and working" is all Gran Turismo is about?