I don't care how refined or accurate any racing sim is
That was put badly. It is a good thing that PC racing sims strive for accuracy. They set standards that all realistic racing games strive to match, to one degree or another.
However, they are rather sterile, dry and clinical. Technical. They're like an
Ansel Adams versus an
Andrew Wyeth or
Rembrandt. The Adams works are incredibly detailed, but black and white. Precise. Frozen, seemingly cold in every scene.
And then we turn our attention to the painters. They're accurate. However, now there's a bit of expression which is missing from the photographer, or at least is present in a much different way. Color. Emotion. Passion. Even fun.
And that's what Gran Turismo brings to the party. There's a sense of seat of the pants adventure and fun that's not quite there with a purist racing sim. There's no exploration of the automotive world. There are no surprises in used car lots. No prizes, or at least not fun ones. Limited classes, few choices, and lots of rules, often with race wardens nagging you over a radio if you get carried away. The rewards are almost all limited to race wins, lap times, and board bragging rights over tenths of a second, and that's about all. No amazing sleeper cars which with the right mod at 300hp, become serious racing machines you might not have suspected.
Forza has this too, but it's much more raw and visceral. Forza is like the wild gunplay of Red Dead Revolver or Quake, versus the refined, polished, but still very fun Rainbow Six or Metal Gear Solid.
And that's what Gran Turismo is all about. Sure, there are rules, all games need rules, but they aren't the focus of the game. The stars are the cars. The story is all of motorsports history. And there's a bard weaving his magical music through it all, named Kazunori Yamauchi.
This is why, to me, Gran Turismo will never be just another racing game.