> With Live Speech on iPhone, iPad, and Mac, users can type what they want to say to have it be spoken out loud during phone and FaceTime calls as well as in-person conversations. Users can also save commonly used phrases to chime in quickly during lively conversation with family, friends, and colleagues. Live Speech has been designed to support millions of people globally who are unable to speak or who have lost their speech over time.
It's clearer that it's for "at risk" users after, but I guess "millions of" was a marketing requirement.
> For users at risk of losing their ability to speak — such as those with a recent diagnosis of ALS (amyotrophic lateral sclerosis) or other conditions that can progressively impact speaking ability — Personal Voice is a simple and secure way to create a voice that sounds like them.
[0] https://www.apple.com/newsroom/2023/05/apple-previews-live-s...