The hurdle there is comprehending multiple speakers with different backgrounds fast enough. Typing that fast isn't unrealistic if it's your own thoughts you're putting out.

Try to outrun a court stenographer using a text-to-speech program.

A trained court stenographer can 225 to 360 words per minute. This guy, optimistically, claims he can do 150.

Nah thats nothing alike. Have you tried dictating things as notes or instructions? It's impossible to beat even average typing speed.

2 reasons : first there are multiple speakers, second speech contains a lot of words that could be optimized away in a prompt but matter for courts. My voice prompts are so dirty and unclear compared to well thought, text ones