Change brightness based on the majority color of screen. Like this macOS application: https://github.com/anishathalye/lumen Related thread: https://www.reddit.com/r/kde/comments/976pyu/adaptive_brightness/
KWin is not in control of the brightness and thus this is out of scope.
Yeah, I wasn't too sure of where to file this. Can you please tell which KDE component deals with brightness, so I could re-open it there?
I think this is out of scope for everything in Plasma.