I list dark themes as one of the key inclusive design decisions next to dynamic font sizing. It’s great to see Microsoft heading in this direction and perhaps even adding a second dark theme.
I am unsure why the retina burning white backgrounds has held strong for so long. After all everyone uses their phones in dimly lit environments where dark themes mark perfect sense.
Would love to see this in Mac OS as well as iOS in the near future. With the transition to OLED screens that is highly likely.
http://news.softpedia.com/news/why-a-dark-grey-theme-would-make-sense-in-windows-10-507249.shtml