Clokwork the color gamut wasn't as wide as it is now. My thought is that the amount of temporal dithering happening now is much higher as compared to earlier IOS versions
FYI, dithering is for increasing the "color depth" (the amount and "precision" of in-between shades of grey between black and white, for artificially decreasing banding and the "stepped" look of gradients)
dithering isn't supposed to increase the "color gamut" (how vibrant a color is). this is a common misconception on this forum
e.g. 10-bit compared to 8-bit leads to more precise shades of gray and gradients. but not more vibrant or brighter colors
this makes me think that the change is not necessarily dithering, rather another change in what post-processing is used in the display pipeline which makes colors and lines seem way more intense
(such as possibly really aggressive sharpness or adaptive contrast enhancement.
or, maybe some sort of strange color processing that is more complicated, for example reminiscent of the tactics described in Samsung's "depth perception enhancement based on chromosteroposis" research paper, or the "Chromablur: rendering chromatic eye aberration improves accommodation and realism" research paper)