Unfortunately x265 is not tuned for grain retention. We have fought that issue for years but the devs have never considered it a high priority thing. The tunings are not revised at all, and the first three AQ modes were mostly just ported directly from x264 and then left as they are.
The biggest issue with x265 is is that the most capable people left a long time ago and even patch validation has had issues with features getting worse with development.
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And if the band you're in starts playing different tunes
I'll see you on the dark side of the Moon...
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