Forwarding my discussion on Arkham Knight
My testing shows crashing can be avoided by setting:
[Window.System]
DontHookWndProc=true
[Steam.Log]
Silent=true
A couple of Denuvo-protected games need that or periodic memory scans they do will abort the game. If more games needed this, it’d be set by default 
It’s particularly bad in Arkham Knight because every time you give the game input, it triggers memory checks. I see no evidence to suggest that is a cause of performance problems in the game, but it is definitely a stability problem if you are trying to modify it.
Now… how to explain these necessary changes in the compatibility list I really don’t know? 
This isn’t inherently problematic to the HDR part of SK, SK in general doesn’t like Arkham Knight anymore due to its DRM.
With that, HDR in Arkham Knight is incredible! I am fairly confident this blows that auto-HDR stuff on Xbox Series X out of the water.