Swiss, I think G simulation comes first because it's the main fatigue factor for a pilot. A 360 degrees view can be achieved with goggles or screens, there are clever ways around it.
No matter how good your aeroplane is, if you can't withstand G loads you're gonna be more vulnerable. I tell you this from personal experience: 15 minutes of intense aerobatic sessions can easily turn you into a sweatball. The first time I did aerobatics in a Mustang (and I was just a passenger!) I was in shock: it's all so physically intense that the idea of actually concentrating on a dogfight whilst being squeezed at 5.7 Gs is unfathomable unless you have been training hard..

I always think about it when I see our dogfights in the sim, where people keep on merrily pulling Gs for 20 minutes without actually thinking of how they would be exhausted by then... (which reminds me to post this on the "suggestions for Ilya" post!)