Listening to a British intro to an accessibility standard, words such as "might" and "could" sprinkle the narrative. So much so, that one wonders whether or not people realize just how much verbal hand-waving they are doing.
The video is here on YouTube.
Do you want accessibility? Then set up objective tests with a real, live testing framework. Don't rely upon the subjective ideations of a Web Designer.
No design process can serve every audience equally well at the moment a site is released, let alone as it degrades over time. An incremental regression testing process is the only way to practically achieve and maintain accessibility over time.