Not an opinion, I have an actual situation with my eyes where they twitch uncontrollably when presented with bright lights for a long period of time. I have tried minimum screen brightness, lowered contrast/colors, auto brightness based on the environment, various software solutions to removing blue light 24/7 from the screen - none of it worked. Went permanently dark theme on everything, magically eyes haven’t twitched in years.
Light theme vs dark theme is not just a preference, it’s an actual accessibility need for some of us.
The light flickering on stars and planets has to do with the Earth’s atmosphere. In a dark sky look straight up and the stars directly above you will blink much less, and as you look at stars closer and closer to the horizon, they start to blink more and more. The worse your overall seeing conditions are for the night, the more intense the blinking can get.