“In the entertainment industry, film grain is widely present in the motion picture and TV material and is considered part of the creative intent. The grain is inherent in analog motion picture film due to the process of exposure and development of silver-halide crystals dispersed in photographic emulsion [2] as randomly distributed grains appear at the locations where the silver crystals have formed. Digital cameras do not produce film grain; however, in post-production, film grain is often added to the captured material to create the “movie” look. Therefore, when encoding motion picture and TV content, it is important to preserve film grain to maintain the creative intent of the content creators.”
Were you aware that film grain synthesis is mandatory in the AV1 codec?
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The Daejeon Chronicles 
The paper mentions making inclusion of “support for film grain synthesis” mandatory in the AV1 cedec. It is not suggesting that its use is mandatory.
My bad, Tom. The source for film grain synthesis being mandatory in AV1 is from a presentation Norkin gave that is available on YouTube: https://youtu.be/7kgbj0dBL_M?si=R8WNxB1WnizYWqFF