Though with the brightness correct there is no evidence of any human advantage to "dark mode". In pre-GUI CRT days most screens used dark mode. It was only brought back to save power on OLED as dark mode is less than 1/6th of the power. Fonts are all optimised to alias and hint as black on white. It makes no difference to eInk or LCD power consumption in principle. The backlight (LCD) or frontlight (eink) may be to set higher for dark mode which is the only reason it seems easier on the eyes (having it too high in normal mode).
It's partly fashion and partly some people have got used to it on LCD screens otherwise set too bright.
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