So Supra, SUV's aren't part of GT? Is that why in GT2 there was a Forester, Panjero, and that Diahatsu SUV? Ohh and lets not forget the Demio, it's really a van. And the Accord Wagon was a nice GT touch. Ooo ooo don't forget all of the Micro vans like the Suzuki Wagon and the Diahatsu Move. Ohh and the Diahatsu pickup thingy.
Yea, your right, GT tradition is all racing...wrong. GT is about cars, not just racing. Hell if it was just the racing, then I probably wouldn't own any GT games at all. To me, it's all about the cars. Hell put a Blue Bird school bus in GT and I'd be able to learn stuff about them. GT is a great info source for cars, and I know it probably sounds dumb, but I've learned tons of stuff about cars from GT, and by adding different kinds of cars, we all could learn more.
Like Neon said, it's fun to race racecars, but it's awsome driving the car that you own in real life and actually pushing it to it's limits to win a race. Kinda gives you that feeling like you just ran a marathon and won.