I'm not objecting to anyone having the personal preference to use dark mode. I'm just pointing out that the current reason for the promotion of it is power saving on OLED phones and tablets. It's nothing to do with eye conditions.
Like serif and sans fonts, some people have a preference and feel dark mode or paper mode is easier to read. As with the fonts there is no clear evidence that it really helps. But unlike serif vs sans it does save power on OLED.
Similarly there is no actual evidence that monospace or a special dyslexic font help people that are dyslexic.
The biggest advantage of ebooks (not PDFs) is being able to change the font size, line spacing and margin to suit taste or comfort. That's far more important than dark mode.
Do use what suits you. Be aware of nocebo and placebo effects!
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Also people that pick grey body fonts (for paper or dark modes) should be banned from web page, ebook and paper book formatting / production. Designers also should not force Dark Mode Web Pages on everyone. People can use a suitable browser it they want that.
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