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.
