When I read what someone has written, I learn things beyond its literal text from the fact that I’m reading it, which implies it was worth effort for them to put into so many words and send to me through the medium they chose and put the level of care that they chose into their wording.

The LLM erases those choices and erases the cost of verbosity so there’s much less for me to learn from a message, and much less I stand to learn about a person though repeated exchanges to help me better contextualize future messages I receive from them.