This is exactly why it can be so effective when used correctly. Obvious, if you're painting, black looks uncanny, but that's a far different situation than digital design.
Not quite true. Black holes for instance. Also, there's some carbon nanotube pigments used to absorb like 99.9999% of light that lands on it. It still looks pure black even when using a powerful flash to take a photo of it. These pigments were developed by NASA for use in telescopes where even a little bit of light can ruin the image.
Also, all of the articles on your website link to this story. Great reads.