fish I agree that a full-featured dark mode is likely best done with an extension, but the desktop page tweaks feature shows that a very lightweight dark mode can be implemented that will cover the vast majority of cases with a very simple, lightweight script. Just like with ad blocking, I think Orion should offer a basic native option that’s “good enough” for most users, and importantly that works fast and seamlessly as a native feature, and for users that want more functionality, they can download a full-featured extension.
All Orion needs to do is integrate the Page Tweaks feature on mobile as a site setting that persists and that can also be set to default to either always on or always off.