I feel this a bit, since I'm a voracious reader and a constant writer across a few languages (but mostly English), which over the decades has led to my converging on a certain (if imperfect) degree of polish. Plus my multiple concurrent and often fragmented simultaneous trains of thought while writing lead me to use parentheticals very often while drafting, which then means I often need go back and re-introduce structure.

And guess what, when you revise something to be more structured and you do it in one sitting, your writing style naturally gravitates towards the stuff LLMs tend to churn out, even if with less bullet points and em dashes (which, incidentally, iOS/macOS adds for me automatically even if I am a double-dash person).