That actually does make some sense to me, the same thing is done for video encoding, sort of.
If there's a static scene it encodes it at super high quality (but makes up for it by saying "don't change" for a while).
But if there's a fast scene a lot of details can get smudged without anyone noticing. I think people only tend to notice block artifacts with steps in luminosity during dark scenes, but I think you have to have a really bad encoding for that to be an issue in 2020.
If there's a static scene it encodes it at super high quality (but makes up for it by saying "don't change" for a while).
But if there's a fast scene a lot of details can get smudged without anyone noticing. I think people only tend to notice block artifacts with steps in luminosity during dark scenes, but I think you have to have a really bad encoding for that to be an issue in 2020.