The Tech of this Game is overall not really interesting most Illusion Games are more interesting, the crazyiness in protection for a Unreal Based production is just insane for having nothing special under the hood at all
You are awesome @Bupo
Ther'e a lot of Simulation parts being added to Paralogue ontop of the Unreal Core which gonna eat your GPU/CPU if you going to get CPU bound, also Nvidia Hardware is going to brake apart fast managing this overhead efficiently on the Driver side DX 11 is no solution in the long run, you need to call Nvidias APIs Directly from within Unreal low level to avoid many of these problems and this opens many more problems at the same time.
Witcher 3 is not over percentage trying to be a Simulation it has only very minor Simulation parts inside of the Red Engine 3 Core and overall bad implementations of those (sponsored by our lovely Nvidia R&D).
For VR the Simulation part of things (Physics) takes a much higher Space and thus is going to take a lot of combined resources, older High Level APIs and Single Threaded optimized Hardware Paths will not really manage this efficiently anymore in the Future, they have to go ways to reduce overhead in other places.
Comparing Witcher 3 with some like these Simulation targeted "Experiences" is the wrong way to compare, especially as Multiview Rendering and Single-pass Shader Execution are nothing a Game like Witcher 3 has to fight with creating VR 3D Depth and to reduce the overall "experienced latency from playback device to HMD" in a range at best of like 10-20 ms per frame constant as your goals on a broad range of target systems in the complex PC configuration space.
You can compare Witcher 3 with things like Assasins Creed, Watch Dogs, Grand Theft Auto, Mafia 3, Metal Gear Solid,Dragon Age Inquisition, Hitman, Tomb Raider whereby some have more Simulation Core Parts and some less but overall the balance is the same per Frame.
In a VR Production that's goal is Present this is much more per Frame, especially when we talking about trying to Simulate Humanoids with the Present Goal, which you gonna see the majority of Adult Productions gonna fight with.