That makes sense. A problem with typing directly from speech is that you don’t know where a sentence is going until it gets there, so it’s extremely difficult to punctuate on the fly.
This is true, but I was a good dictator, back in the day.
I could have typed the letter myself, but I didn’t have access to a typewriter in that office.
In a later office, with a different secretarial staff, sending out my own letters became a necessity, if I wanted them to look right.
Case in point, I tried pointing out to one of the new secretaries that using ten-point type on twelve-point spacing made a word like “book” into a word that was spelled “w-infinity-k”.