It's really not that extreme. Dark mode is more comfortable as soon as it's dark outside (this time of year that starts between 3 and 4 pm) unless I'm flooding my entire room with enough light to replace the sunlight. I still have the lights on, but none of that light is as bright/white as an average white webpage. Even with screen brightness turned down and a blue light filter, an all-white webpage is usually just too much white.
> Light mode might be annoying to read in no-light environments, but dark mode is nigh impossible to read in high-light environments.
This is just completely opposite for me. Reading in dark mode is only uncomfortable if there's sunlight basically directly behind the screen, while light mode is only really comfortable in high-light environments.