This was really helpful to see how the author thought through the palette's creation. In my experience, I came to similar results, but over a long period of time and rather haphazardly after endless tweaking.
I would add that often times it's helpful to define a "light on dark bg palette" and "dark on light bg palette."
I would add that often times it's helpful to define a "light on dark bg palette" and "dark on light bg palette."