Lots of things - typical llm em-dash situations although using dash. Lists of 3s after a colon where the 3 items aren't great. Short sentences for "impact" that sounds kind of like a high school essay i.e. "God level engineer...Zero ego."

I cannot at all understand writing an essay and then having an llm "tighten up the sentences" which instead just makes it sound like slop generated from a list of bullets

Adding to this: too many negatives before making a point, which AI text is prone to do in order to give surface level emphasis to random points in an argument. For example: "I sat there for a second. It didn't lose the thread. It didn't panic. It prioritized like a real engineer would." Then there is the fact that the paragraph ends in just about the same way, which also activates one's AI-voice-detector, so to speak: "This wasn't autocomplete. This was collaboration."

In my opinion, to write is to think. And to write is also to express oneself, not only to create a "communication object," let's put it that way. I would rather read an imperfect human voice than a machine's attempts to fix it. I think it's worth to face the frustration that comes with writing, because the end goal of refining your own argument and your delivery is that much sweeter. Let your human voice shine through.