> Common advice here will be not to use pure black or white colors, which, as perfectly described in the article, hardly present in the real-world color pallet.

However, on the OLED screens that are all the rage now, and for good reason, a pure black background means those pixels are off, which saves power and shines less light into the user's eyes making the screen less tiring.

Aesthetics aren't always good for your health/battery.