What I'd love is GOS built-in apps to have adaptive icons depending on the theme (light/dark) if it's even possible.
I don't like applying themes because it changes all icons, at least the majority of them supporting alternative icons. I'd like to keep the original icons of apps but have GOS built-in apps have something else than pure white-and-black icons :-( At least a bit greyer would be nice. Pure white icons stick out like sore thumbs.