(tangent to your question because someone already answered) I think that courtroom stenographers (people who type up what’s said) use special chording keyboards. I’ve also been to a few events where there has been someone transcribing things in real time for accessibility purposes, and they also use a cool looking chording keyboard. It takes some learning, but the max typing speed is way faster than any conventional keyboard could manage — which is why skilled people use them for transcribing stuff

A brand that I’m aware of that does them is Charachorder.