I have been using Dark Mode for several months but switched back to Light Mode after reading Adam's article, and, generally, I'm happy either way. The exception is programming in Xcode. I have defective colour vision, and syntax colouring works far better for me in Dark Mode than in Light Mode. I suspect that the contrast of dark text on light background neutralises the difference between the colours more than light colours on dark background. I've experimented with various themes, and will continue to do so, but the dark background seems easier to pick out the colours for me.