For someone who writes all day every day, their ability to explore ideas is somewhat limited by the speed of their writing mechanism (hand v.s. machine), becaus

For someone who writes all day every day, their ability to explore ideas is somewhat limited by the speed of their writing mechanism (hand v.s. machine), because they're not really "just sitting and thinking" most of the time but trying to "capture each thought" before moving to the next idea, which is laborious and slow. So simply by being able to move faster along the process means you can fit more ideas into your short term memory, because you're traversing thru the ideas at a faster rate. Once you can fit more ideas in, then each idea can have room to become more complex. I think that's the "mechanism" (pun intended) by which your consciousness/intelligence improves simply by being able to write faster. It's probably partially also why stimulant drugs can make people appear more intelligent. The faster you move thru ideas, the more information you can fit into working/reasoning memory. It's the same thing as lengthening the "context window" in an LLM btw.