It's like the swiss cheese security model. You don't have to and can't cater to every possible individual disability in the same happy path as long as you've p

It's like the swiss cheese security model. You don't have to and can't cater to every possible individual disability in the same happy path as long as you've provided options to allow people with the most common disabilities to use the $thing in some way. People that are simultaneously blind, deaf, wheelchair-bound, and mute are not actually that common and design guidelines aren't written assuming that every disabled person has every disability simultaneously.