Writing as Thinking vs. AI as Thinking

According to writing professor and author of Why They Can’t Write, John Warner, “Writing is thinking” because “the basic…unit of writing” is the idea (144-145, emphasis added).

However, in May 2023, a student at Columbia University, Owen Kichizo Terry, wrote an article in the The Chronicle of Higher Education claiming that when college students are given an essay assignment “it’s very easy to use AI to do the lion’s share of the thinking” and therefore, “writing is no longer much of an exercise in thinking.”

Writing Prompt: 
Do you agree with John Warner that writing “is thinking” or that you own writing should be “an exercise in thinking”? Or do you agree with Terry that it’s OK for Generative AI “to do the lion’s share of the thinking”? Explain.