Aren't asetto corsa iracing or dirt 2.0 the full games in VR on PC ?
And what about the excellent forgotten Driveclub VR which also was a full game with full races and even MP.
And Project Cars 1, 2, 3. Don't get me wrong, I expect GT7 to look a bit better than those games even when played on high end PC hardware. But those and other full racing sims have been available on PCVR for years. GT7 is at best an evolution of what's been around for a good while already.