"between ambient light and backlight leakage, by the time a color makes it to a screen, not even plain black (#000) is pure; instead it has become a grayer shade."

This is changing. The best phone displays display "pure" black. If you open a black image on the screen, you cannot tell if the screen is on or off, even in pitch darkness.

I love pure blacks in my apps and Web pages, contrary to the author.