There's been too much debate and not enough practical experimentation in this area. Here are some suggestions for people to TRY OUT and get some real experience to compare real-life internal views only, versus computer-internal-views, versus computer-external-views. All it takes is to drive your car.

1. Nobody ever takes notice of it, but next time you take turn your car, note how it feels on your body. It's more than just your bottom; each part of your body senses the change in direction. This is an extremely important feedback input that we simply don't get and won't get in the simulator.
2. Turn your head to the right and merge into that lane smoothly. You can in fact feel your car's aspect wrt the road and the bandits, er, the other cars even if your head is turned away from the front view. Your peripheral vision also helps greatly in keeping your orientation.
3. On a long stretch of road with few or no cars, focus on a distant target, and padlock on it while keeping the car going straight. It's pretty easy to do so, with both the motion cues and peripheral vision providing all the input needed to stay straight.

And this is just a sample of true-life experience you can compare to the PC simulator. All of the tasks above have an analogue in a driving sim or a flight sim. In a computer simulation, the only feedback we ever get is the position of the joystick. There is simply not enough info to smoothly control the simulated vehicle.

As you can guess, I am in favor of the external views for making up the lost motion feedback and peripheral vision in the true moving vehicle environment. In real life, it is possible to parallel park or back-up into a tight parking space even in a truck with very restricted views. In a computer simulation this just won't work.