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Re:Material Design Guidelines for Dark Mode by Zak on Wednesday May 15, 2019 @12:38AM (#19916456)
While the other trends you're mentioning are primarily aesthetic, dark themes have a significant ergonomic motivation in that they allow sufficient contrast at much lower luminance. I've long thought pervasive dark themes were overdue given smartphones greatly increasing the number of users looking at screens in environments not resembling brightly-lit offices.

They also save power on OLED as the guidelines and other commenters have mentioned.

Re:Material Design Guidelines for Dark Mode by spectramax on Wednesday May 15, 2019 @12:45AM (#19916492)
Also, how easy they are on the eyes - most popular IDE themes tend to be dark. My rant was venting about "trends" in aesthetics. When trends emerge due to underlying technical reason (DPI/resolution, power savings, etc.) they add a tremendous value. I remember writing php backend to process 1x and 2x images when Retina screens had just released in 2012. That led to responsive images and many other advancements on the Desktop UI side - all good things.