As stated, because both involve sensitive and personal information about people - unlike say, Stable Diffusion which is using AI for creative image creation etc.
> why do lawyers and doctors get it wrong all the time
Because they're human. "Medical error" has been in the top 5 causes of death in the United States for several years. Our legal system is also far from perfect and could use the help - consider systemic biases and wrongly convicted people who spent their lives behind bars unfairly due to human error or bias, omissions of information, etc.
Doesn't it answer it?
> Lawyers and doctors get it wrong all the time
This is a tool that helps them get it right