I feel like there is also the "Nerd Factor" to consider which is this unrelenting passion to type away at a screen all day, whether that is yesterday's code or tomorrow's prompt. Few non-technical people have the attention span to suffer such monotony. (Even most devs don't have that to varying extents)

Aye. This is true for many professions, I think.

I'm trying to write a novel, have been for a while now; one thing I hear from professional writers is that one should only do this if you are prepared to re-read whole thing six times before you even send it to the editor, and when you do send it to the editor, you and they will likely spend several months repeatedly re-reading the whole thing as you respond to a long list of changes they give you.

It's only monotone from someone looking, not from someone doing. If you look at digital painting tutorial, you'll see a lot of timelapse, because it's a very slow process where you spend the majority of time correcting stuff. But if you're the one doing it, each individual brush stroke is the result of a conscious decision.