I'm also sick of this trend in particular when websites or apps start shipping dark mode as default. It's not a good way to read text. Light text on a dark background reduces the amount of light getting into your eyes, it means your pupil needs to open wider and that has several negative effects one obvious is a halo-effect around letters that makes light text bleed into the background reducing readability. You don't really need to trust any science for that. Look at bright text on dark background and then look at a white wall. Chances are you can literally still see the text as an after image.

The reason why so many people seem to switch to it is because they literally live in goblin caves without proper lighting. Working in a well lit room and not at night and a properly configured monitor is a much better solution than dark mode.