I don't get this infatuation with dark mode, beyond it looking cool. People claim it helps with eye strain, but a brighter background constricts your pupils, improving focus.
In my experience light mode will work fine on things like e-paper displays, but when you have an emissive or transmissive display the bright light can be straining.
I also feel like dark mode highlights text more, making it easier to identify the text. If I use light mode in text editors I get completely lost very quickly.
I think people might have different sensitivities to this issue. Before I changed everything to dark mode, I had trouble concentrating on a bright screen especially in a dimly lit room. Dark mode feels like a total game changer for my productivity.
It never occurred to me that this could be the reason for dark mode blurriness, but it makes sense intuitively. (Think you mean "constricts" rather than "dilates" though.)
The only thing I have to add is you can think of constricted pupils like a pin-hole camera or a higher f-number on a camera aperture. You need brighter light, but the depth of field is wider.
I don't get this infatuation with dark mode, beyond it looking cool. People claim it helps with eye strain, but a brighter background constricts your pupils, improving focus.