Use host system accessibility APIs?

[brennanyoung]

Rather than copying a subset of the behaviour of screen readers, would it not be better to hook into the host system accessibility APIs? (i.e. those already built-in to Windows, MacOS, Android, iOS, Linux). Those APIs are fairly mature and stable. Moreover they are predictable for assistive tech users.

Relying on host system accessibility APIs, you can support a much wider range of assistive technologies, including custom user dictionaries, preferred voice synthesisers, switch interfaces, braille interfaces or whatever.