Hi Patti -
Web accessibility is based on the principle of universal design, where you
should be building and designing to help everyone. For web accessibility,
that means that access should be built from the start for all, which is
where David is coming from.
Once we move from the web into other media like virtual / augmented reality
or voice interfaces, I'm not sure that the principles of universal design
will hold up. I think we may have to design parallel user experiences for
people that are differently abled. But for the web today, there are no
breakpoints for disability like there are in responsive web design.
Claudio Luis Vera
--
User Experience | Information Architecture | Accessibility
simple-theory.com