Because people have gotten used to using their devices at night and in badly lit rooms. I think it's one of the worst design trends in recent times with negativ

Because people have gotten used to using their devices at night and in badly lit rooms. I think it's one of the worst design trends in recent times with negative effects: "[...]To summarize, a dark-on-light (positive polarity) display like a Mac in Light Mode provides better performance in focusing of the eye, identifying letters, transcribing letters, text comprehension, reading speed, and proofreading performance, and at least some older studies suggest that using a positive polarity display results in less visual fatigue and increased visual comfort. The benefits apply to both the young and the old" https://tidbits.com/2019/05/31/the-dark-side-of-dark-mode/ https://tidbits.com/2019/05/31/the-dark-side-of-dark-mode/