Came here to say this. I could see people with mild social anxiety (mild enough that it doesn't require professional help) using this to improve themselves.
Replying to you and parent - thanks both for these comments, and it's a really great idea. I could see a product today (maybe even this) being helpful for practice. But I think to make genuine claims about assessment and improvement, off-the-shelf AI isn't there yet, because there's such an incredible amount of information in the way something is said. Basically the entire study of prosody. Then, there's all the body language---which, if you believe anecdotes, conveys a high % of the received information. Long term, it's a great goal.