Earlier quoted context omitted.
Indeed. But it does look nicer/work better for what black themes are actually good at: Using at night. So while the additional battery savings between "true black" and grey are within the margin of error, the battery benefits remain for both and the non-battery benefits remain for our eyes.
Feels like "dark mode" is an advertisement gimmick more than a useful feature for some products now.
- Dark mode saves battery (for OLED displays). The discussion was on "true dark" Vs. grey. Not dark Vs. non-dark modes.
- Dark mode is useful in low light/dark rooms/night usage.
It isn't a gimmick and a lot of people like it. I happen to be one of them. I'd use it even without any battery savings.