I feel like the opposite/something else is missing. I can write lots of text quickly, if I just write down my unfiltered stream of thoughts, both together with and without an LLM, but what's the point?

What takes really long time, is making a large text contain just the important parts. Saying less takes longer time, at least for me, but hopefully saves the time and effort for people reading it. At least that's the idea.

The quote "If I had more time, I would have written a shorter letter" comes to mind.