There's indication that 00/FF contrast can be problematic, especially for dyslexics [1]. The ridiculous part is the amount the contrast is often toned down as

There's indication that 00/FF contrast can be problematic, especially for dyslexics [1]. The ridiculous part is the amount the contrast is often toned down as a result. No one benefits from a sea of grey on grey bordering on unusable. [1] http://www.bdadyslexia.org.uk/dyslexic/eyes-and-dyslexia http://www.bdadyslexia.org.uk/dyslexic/eyes-and-dyslexia