Thanks for the feedback, and no, it's not about energy savings, it's just a preference: If I'm using my phone in a dark environment, and every other app and website that I use regularly respects the dark mode setting, then I just find it really unpleasant to have your eyes suddenly blasted with white light (this is true even when the display's brightness is turned down and/or the blue filter is on). And in my experience, dark mode is improved by having modern, good screens that have good black levels; I'm not sure I'd find dark mode on an old CRT or even an old LCD with a strong backlight blead as pleasant.