¿WCAG es la "biblia" de la accesibilidad?

Siguiendo con lo que se comentó en mi entrada anterior Más allá del cumplimiento de WCAG, ¿qué es lo que dice el W3C al respecto?

Lo podemos leer en la introducción de WCAG 2.0:

Web Content Accessibility Guidelines (WCAG) 2.0 defines how to make Web content more accessible to people with disabilities. Accessibility involves a wide range of disabilities, including visual, auditory, physical, speech, cognitive, language, learning, and neurological disabilities. Although these guidelines cover a wide range of issues, they are not able to address the needs of people with all types, degrees, and combinations of disability. These guidelines also make Web content more usable by older individuals with changing abilities due to aging and often improve usability for users in general.

[...]

Note that even content that conforms at the highest level (AAA) will not be accessible to individuals with all types, degrees, or combinations of disability, particularly in the cognitive language and learning areas. Authors are encouraged to consider the full range of techniques, including the advisory techniques, as well as to seek relevant advice about current best practice to ensure that Web content is accessible, as far as possible, to this community. Metadata may assist users in finding content most suitable for their needs.

Es lo que hay... pero por lo menos tenemos esto. Mucho mejor es tener WCAG, aunque no sean perfectas, que no tener nada.