Spotters, circuit racing, and oval racing in computer games are much different than in real life. In real life, for NASCAR, the way the seats are designed for the safety of the drivers, the drivers can not look beside themselves. The headrest part of the seat wraps completely around to the sides of the helmet. They can only look up ahead and in their center mirror. There is also no side mirrors on a NASCAR racecar.
The big difference between circuit racing and oval racing is the side-by-side racing. In NASCAR, it is continuous side-by-side racing that can last the entire race. Cars side-by-side coupled with the fact that they can not turn their heads and look beside them is why they have spotters. There is no "overlap" and "my corner/your corner" rules in NASCAR. The spotter tells the driver when there is a car there so they don't run into each other. It is common for 2 cars to run lap after lap with inches worth of overlap at the front/rear bumpers. In circuit racing, that would necessitate someone to back off because of the "corner rights" and "overlap" rules (at least, talking LFS racing in that respect). In real life with circuit racing, it would be easier to be aware of cars around you because of the ability to see beside you and the use of the external side mirrors.
If I recall, with NR2003, you also could not look beside yourself. I think the view moved with animation to a 45 degree angle.