I am not sure if this has been talked about. I couldn’t find anything regarding it. But I would like to propose an option in GNOME Settings to toggle Yaru Dark. Currently it can only be done through GNOME Tweaks.
I think this is a great idea. Would also love to have some kind of timed trigger (i.e. the way Nova Launcher does it on Android) where it switches to dark theme in the evening. Could even be connected to Night Light!