I think people write a rough draft and let AI clean it and fill in the gaps, which leads to all usual phrases. I suspect some people have become so reliant on this they're now desensitized to AI speak.
And desensitization will eventually turn into a preference for AI speak. (Perhaps not the HN crowd.. but definitely for the average Joe)
People prefer reading things in a tone/style that's comfortable and familiar to them. Writing in a way that mimics LLMs checks those boxes.