IMO it's not the recording of ideas that is thinking, but rather the act of putting thoughts into language. To me there isn't a big cognitive difference between conversing about a topic (during which you put thoughts into words) and writing about it.

When you speak or write instead of just think, you create something that did not previously exist: new words and sentences. When you write instead of speak, you aren't exactly creating something new — you're often just recording words that just as well could have been spoken. Using an LLM is much closer to the first case. It's creating something that didn't previously exist (an expanded thesis on a brief thought provided by you), and therefore seems to possibly risk the user's ability to think atrophying.

> IMO it's not the recording of ideas that is thinking, but rather the act of putting thoughts into language.

I agree with you but that article itself says, "for example, handwriting can lead to widespread brain connectivity."