WYSIWYG was much-loved but not so easy to achieve. Home users loved it, using mice and GUIs.
-Dormouse
... but programmers not so much. Possibly because they knew what it might hide. And they were keyboard warriors with masses of memorised shortcuts. Which saved them time as their hands never needed to leave the keyboard. Most journos too; early newspaper systems weren't great at GUI.
But that was never me. Despite using a typewriter since I was a child and teaching myself to touch type on one in my teens. Despite being a very fast typist. Most of the time my hands weren't near the keyboard and I was looking at the screen and thinking. When I was on the keyboard, I was typing words.
But preferably not using a word processor. I've always avoided those for actual writing as much as I can. Nothing to help me as a writer, many irritations interrupting my thinking. Liked outliners from the beginning because they gave a bit of organisation, faster access to my writing and irritated less.
The majority of people learned to use word processors at school and that's what was made available when they went to work. With GUIs.
But programmers had their text editors, keyboard shortcuts and numbered lines to help them navigate. And using them meant being used to working with syntax mixed visually with content.
And for my style of editing the mouse is faster than the keyboard.