Re: And have these idiots...
Also consider that you only get the OLED switched off benefit with true black, i.e. #000000. And even dark mode hardly ever uses truck black, because its uncomfortable or too harsh. It's typically just a very dark grey. For those on OLED you're not going to get the pixel-off benefits. Sure, you might still score _some_ power savings, because it has to omit less light than full brightness.
Aside: A problem with most dark themes is that they're simply colour palette based, i.e. swaps whiter colours for blacker ones. And the poster about mention, vision is far from linear. It's harder to read light text on a dark background vs dark text on a white background unless you also adjust the text size, weight and spacing. Because, with the dark background (and presumably matching low ambient light) your pupils will dilate. When dilated, they don't track as well, i.e. smaller things become harder to focus on, i.e. text need to be larger/weightier and spacer more generous. I've yet to see a dark mode that does things close to that well.