It is the most realistic view in the sim because it tries to simulate what a
real NASCAR driver sees, you are correct. The problem is how you define
realistic. If your realism is based around seeing what a NASCAR driver sees,
hearing what they hear, then you will believe the***pit view is more
realistic. Nobody will argue. If, on the other hand, you believe realism to
be giving as much of a window on the world as possible, to make it easier to
judge exactly what the car is doing at any particular moment, to be able to
add some depth perception to a display which naturally removes it (ie
viewing on a monitor without 3D glasses), then the roof cam is more
realistic.
The fundamental qualities of a racing driver are the ability to look ahead,
to not concentrate on what the car is doing now, but what it will be doing
in a few seconds' time. To be able to judge exactly where you will reach the
edge of the track if you start applying the power now. To preempt what the
car will do, where it will end up if you alter your inputs at this moment in
time. It's all about predicting the future. If you apply the power too late,
you will be slow out of the corner, not using as much of the track as you
could have. If you apply it too early, you will run out over the kerbs and
onto the grass. Some people (in fact, most people who drive sims and think
they are great racing drivers), learn visually when to hit the throttle out
of turns in terms of trackside objects or markings in the road. Some don't
realise that they are running bad lines through corners until they see a
replay analyser, because a monitor can't give that kind of depth perception
needed to drive properly. A sim racer encountering a new track will either
be very slow to begin with, or spin off at all the corners, because they
have to *learn* the layout of the track; they can't *see* it as they go. A
real race driver will be able to lap relatively quickly the first time out,
because they can calculate on the fly using their visual input.
To emulate this depth perception in the game (thereby making it more
realistic), you need to raise the camera a little, but still keep it locked
to the car (after all, you don't want to lose the visual input of what the
car is doing in terms of sliding, etc).
This point is just as important a factor in the problem with racing sims as
the g-force argument of not being able to feel the car, in my opinion. I
have yet to see what the E3D glasses do to help, but results are encouraging
from what I have heard.
So the***pit view is realistic in some respects, the roof cam is realistic
in others, and a view which combined the realism of both (which is
impossible unless you are simulating truck racing) would be the most
realistic view available.