Both the National Association of the Deaf and the National Federation of the Blind commended #Netflix on adding the playback features. Since #captions are slowed down (and also sped up) to keep in time with the images on-screen, it can help deaf people 1/2
https://www.theverge.com/2020/7/31/21348693/netflix-playback-speed-slow-fast-mobile-android-web-tv-streaming

On the other side, many people in the blind community “can understand and appreciate audio played at a much faster pace than what might be comfortable for most sighted people”