“The color bit depth refers to the number of bits used to indicate the color of a single pixel. More bits means a larger number of colors can be represented”
https://www.inktechnologies.com/blog/wp-content/uploads/2011/04/Color-Depth.jpeg
believe it or not, but it used to be even worse when Asobo accidentally had dropped the color bit depth to 10bit or whatever it was.
(was eventually fixed in some patch. But then again maybe they “accidentally” lowered it again..)