Probably not. One would have to ask dang for an official reason but I suspect it is due to not making changes to the UI. There have not been any significant changes in a very long time.
If using uBlock Origin here [1] are some HN rules I used to change colors and such. Change the color values to match preferences. May not be reachable on some devices
[1] - https://mirror.newsdump.org/hn-ublock-colors-other.txt