"Dark mode" is needed in dark rooms, since screens don't autoadjust their backlight based on the room's white point.

The concept of "white point" is often spoken of in terms of color, but brightness very much does matter too. It is painful for there to be something (especially something large) brighter than "white".

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That said, we should have automatic dark mode based in inverting HSL's "lightness" (this can trivially be done directly in RGB, just check the min and max color channel of the pixel, then adjust all channels to flip them), rather than requiring ad-hoc color schemes all over the place.