I have a calibrated QHD Eizo monitor for desktop and I found that white and grey balance progressively improved in earlier windows versions from 1709 with 1803 showing a marked improvement. However, with 1809 there is a marked deterioration in white balance/gamma. Thus, white looks dirty white in 1809 as opposed to clean white in 1803. Also, there seems to be a lot of uneven grey with black smudging. Overall a marked decline from 1803 to 1809 so much so that for the time being, I am sticking to 1803. As to dark file explorer, does that enhance productivity. I do not think so. Some other generic problems with all windows versions: 1, Looks good on smaller, low resolution monitors but as one goes to 1080, 1440, 2160p; it gets progressively worse. 100% scaling gives a smaller, unreadable font; and 125%+ scaling gives torn up fonts. It is just like low quality downloads looking good on small phones but horrible on bigger displays. 2. I wonder when will Microsoft give us a font style and pitch that will cause us to abandon Mactype patch. That is the only thing that makes fonts look better and cleaner on high resolution displays. However, try use mactype on segoe 125% and on a calibrated monitor and you will see black smudging all over. Tahoma looks much better and neater.