That was a long time ago. And secretaries of that time weren't paid well, either.
I think that what really did in secretaries was email and wordprocessing. Impatient executives needn't dictate letters or memos and wait for them to be typed. They could just send things off worded exactly the way they wanted.
I worked in one place that hired a recently-retired US Navy commander. He lasted six months, partly since he didn't type. Officers had yeomen for that!
And now, LLM AI.