[Stratoscope]

Your comment about the blue filter got me thinking. I assume this filter reduces the amount of blue light, is that correct?

As I mentioned in another comment, I've found that many laptop screens have a pronounced blue-green cast out of the box. The worst ones we have here are a late 2013 MacBook Pro Retina and a ThinkPad X1 Yoga Gen 2 WQHD. These both are difficult to look at with the factory calibration, especially the X1 Yoga which I found literally painful to use in the first part of the Windows setup, before calibrating the display. Everything was an intense green that felt like it was burning my eyes. I can see why someone using a display like that might prefer a dark theme, just to knock out that awful blue-green.

But after I calibrated the display to a pure white, it looked beautiful, just like our other calibrated high-DPI displays.

One other benefit to calibrating displays is when using multiple displays. I use a 24" 4K/UHD display in portrait mode along with whichever laptop I'm using at the moment. (A portrait mode display plus a landscape display is a wonderful combination, for example an entire PDF page fits on the portrait display with no scrolling.) Having the colors look the same on both displays - especially the white backgrounds - makes things much more pleasing to the eye.

To your question about high-contrast dark themes, yes, I have the same trouble with those. Dark themes just don't work for me, nor do low-contract themes, whether dark or light.