Much like our voices, DNA, odor, and personalities are unique, so is our writing style. When I read a wholly-human writing, I get a sense of what kind of a human I'm dealing with. Using LLMs will distort this signal, so readers worth their salt will easily skip the piece, because we don't want to acquire LLM-like writing 'style' (reading affects writing).

As soon as I sense Slop, I'm done, this person refused to think when writing, why should I waste my time reading it then?