Too much Goebbels
Ist a bit difficult to explain but the "in-situ" notion as it is normally understood at least tries to grasp it.What do you mean by an "in-situ" display that's not available from ACC?
Its a feeling (based on the visual) of being on a real 3D track both when you use cockpit view and when you afterwards check it out in replay.
Im not being smart here but I have NEVER had that feeling in either ACC, rF2, pCars2 or recently AMS2.
I get the feeling in Raceroom too but to a much lesser degree in cockpit than in replay seen from trackside.
The strange thing is that eventhough the GTP mod for NR2003 is only DX8 then there is slightly something of this "in-situ" spell dust in in this sim too.
But absolutely nothing in the other racing games I mentioned.
At least ACC and pCars2 looks fine but absolutely not like being on a real track or into a real cockpit.
ByTheWay: Coincidently iRacing is based on the NR2003 game engine - years back..
But my guess is that it has something to do with how the the 3D display and colour and shadows are rendered of the different games.