The article didn’t go into this, but I suspect that a large part of the dark mode trend is due to evening/night computer use. If you don’t light your room, the screen is the only light source which is unpleasant.

But not all of us are working in the open air office... Brightly lit office after 5pm in winter (ie after sunset) doesn't mean dark mode is the best option.

Then you switch?

My entire OS, most apps and 90% of websites switch automatically with a single keyboard shortcut.

No, you change your OS preference and then most websites that are coded correctly will follow. I do it by sunrise and sunset but have a key binding to override it.

This but with a bit more flexibility depending on the state of ambient light. On a gloomy winter day at 51°N I often want dark mode all day.