poets and writers of books (short stories, novels, non-fiction) usually avoid working directly on the computer. where they can, they will usually hand write, on paper, with pencil, their first couple of drafts, editing as they go along. you would be surprised how many of these authors then go to a typewriter for their 4th or even 5th drafts, before entering their work on computer.
the reason seems to be the typewriter allows for pausing and editing as the work is typed. therefore, fewer, if any errors, wind up in the final work.

with the advent of computers and cold type, especially in newspapers, the levels of proof reading have disappeared. so, no copy editor, no lineotyper and no proof reader who sat along with the lineotypest, and finally the people who "dummied" up the pages. as for the last, this word comes from the time when composing rooms hired deaf mutes to make up the pages. they were referred to as "dummies". in my days at the paper i worked at, i cannot tell you how many hours i spent in the composing room and how much i learned from these people. they were valuable and i found, thanks to them, i could read the lead copy upside down and backwards. they were some of my most memorable teachers, and i still miss them all.