Jamie Owen has a two-parter. First up, why web accessibility standards are important:
An accessible website is more than putting content online. Making a website accessible means ensuring that it can be used by as many people as possible. Accessibility standards such as the Web Content Accessibility Guidelines (WCAG) help to standardise the way in which a website can interact with assistive technologies. Allowing developers to incorporate instructions into their web applications which can be interpreted by technologies such as screen readers helps to maintain a consistent user experience for all.
Second, how Shiny apps tend to stack up:
As a quick spoiler, not so well. Read on for the full report.