What is it that adds this? I’ve also noticed it in a lot of modern games like Cyberpunk.
Looks like ambient occlusion with some sort of dithering filter.
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Yeah seems like a side of effect of relying on “fake optimization” techniques like dithering assuming they will be hidden by blur passes like upscaling and/or TAA.
You’ll see it in places like hair and grass too. Stuff will look dithered if you turn off TAA, upscaling, or other effects that turn the screen into an unfocused blur. 
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If it improves performance, it is not a “fake optimization.”
All optimizations are a tradeoff between performance and quality, sometimes those tradeoffs are more noticable / less desirable and other times they can be nearly unnoticeable.
Decreasing the resolution of an effect as we see here lowers the quality of the image while improving the performance.
Decreasing the poly count of a mesh lowers the quality of an image while improving performance, but you don’t see anyone calling LODs “fake optimization.”
Obviously you’re free to dislike any particular optimization, but let’s cut the inflammatory labels.
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