Good article and some interesting comments.
Other assistive tech I’d like to add are: voice control, touch screens and specialist input devices like eye tracking or click switching. Each offering a different way to interact with the web UI.
Multiple imparements are an area I feel often over looked in accessibility, so for people who may have both sight and hearing imparements are most likely to use refreshable Braille displays. Or people may use multiple assistive technology together to gain access to the web.