Isn't that what secretaries and court-room clerks have been doing for over a century?
Besides businessmen, also lots of succesful (print) journalists and writers in the 30s to 80s had personal assistants that they dictated their articles etc to.
For comparison, you are probably only able to type upwards of 80 to 90 words/minute using standard keyboards. And that is, again, with training.
There was a fun article recently that went over writing shorthand. Journalists used to be commonly trained in writing methods where they could get over 100 words/minute. I know of literally zero folks that are trained in that.
The thought of 100wpm on paper, though, leaves me frankly amazed.
Why is it easy to imagine doubling your speed on a keyboard with shorthand, but imagining doubling your speed on paper with shorthand amazes you?
This is what it looks like:
https://en.wikipedia.org/wiki/Shorthand#/media/File:Eclectic...