Until pandemic, most of my time was spent in dimmed rooms like edit bays which is a common lighting condition for that type of space. The dark color scheme is pretty much the default for any software you'd expect to find in that environment. Since the primary type of UI that I create is also used by people in that industry, they typically have a dark background scheme too. Now, that I no longer work in those caves, the bright colors are taking some getting used to and I'm still not there.

For you to say it sucks without saying "for me" at the end of it is just you assuming everyone has the same preferences as you. I can tell you from experience, this is just a bad belief to hold.