Lots of us younger people have dark mode with the screen brightness turned way down. I personally often have my screen brightness at minimum, and on mobile I have Extra Dim turned on for more than half of my usage time.
OTOH reading too low-contrast text is supposed to be bad for the eyes too? (At least that was what parents and educators told me as a kid: “Read at your desk where the light is good or you’ll spoil your eyes!”)
And us older folks have screen brightness turned up as our eyes get worse.
For many years I had white background so I could really see things.
Now with floaters I have to use dark background and many games are now unusable as they have light background and medium unreadable text and strain my eyes.