The only time and reason I use dark mode on portable devices is when they have OLED screen, as dark color = turned off pixel = 0 energy consumed, so it gives better battery life. On a stationary or always plugged in devices, I prefer light mode. No idea why, as opposed to many people, why eyes hurt more when seeing darker colors. This also applies to the so called "eye comfort mode" or "blue light filter", where my eyes can't bear seeing the warmer tone, they want the cooler one. I'm not wearing glasses, btw and my eye lenses are still fairly sharp with quite far maximum focus distance as well as quite close minimum one. Perhaps it has something to do with this.