Let's be frank here...
If you are a 'purist', you aren't playing GTS. You are playing iRacing, or rFactor, or maybe PC2.
If you are a 'purist' you aren't playing in any view other than an Oculus etc..
Anything else is simply one form of terrible compromise over another. Terrible restrictions in FoV compared to real life. Terrible compromises in tire model and physics. Terrible compromises in application of real racing rules and behaviors. Terrible sounds. Terrible collision physics. Terrible off track physics.
So, please... enough with the 'purist' baloney. I'll tell you what really drives the 'I'm a purist, and I think that everyone should use my personal favorite view/aids/tires/cars and all others should be banned!' hogwash. It's usually 'I'm getting beat, and I hate the thought that anyone is doing it different to how I'm doing it because that obviously means their difference to me is what is making them faster..!'
There are bad drivers out there in ALL view modes.
You want 'purity' in a view in GTS? Get a PSVR and be prepared to be unable to race anything but your ghost. Because that is the only view that actually is pure.
I wonder what all these 'purists' that want to wall themselves off from us 'impure' types are going to use as an excuse once everyone is on a VR rig in a few years? Better start coming up with something, because you are still going to get beat, some of the time..!