The Alexa app is great for having books read aloud. But many dyslexic readers don't want TTS — they want to read visually. And the app does have some accessibility settings (or rather, usability settings that are particularly helpful for dyslexic readers).
But there are many other types of assistive technologies out there, including some that are life-changing for all kinds of readers with disabilities. By making the platform inaccessible to browser extension, Amazon has created a situation where their in-house accessibility options are the only ones that can be used. For someone who has accumulated a library over a long period of time, on the understanding that the KCR supports browser extensions, it's pretty lousy to have the rug pulled out with no recourse.
But there are many other types of assistive technologies out there, including some that are life-changing for all kinds of readers with disabilities. By making the platform inaccessible to browser extension, Amazon has created a situation where their in-house accessibility options are the only ones that can be used. For someone who has accumulated a library over a long period of time, on the understanding that the KCR supports browser extensions, it's pretty lousy to have the rug pulled out with no recourse.