Science is also creative writing. We do research and write the results, in something that is an original product. Something new is created; it's creative.

An LLM is just reiterative. A researcher might feel like they're producing something, but they're really just reiterating. Even if the product is better than what they would have produced themselves it is still more worthless, as it is not original and will not make a contribution that haven't been made already.

And for a lot of researchers, the writing and the thinking blend into each other. Outsource the writing, and you're crippling the thinking.