Many of these are standard fare in legal writing.

Negative parallelism is a staple of briefs. "This case is not about free speech. It is about fraud." It does real work when you're contesting the other side's framing.

Tricolons and anaphora are used as persuasion techniques for closing arguments and appellate briefs.

Short punchy fragments help in persuasive briefs where judges are skimming. "The statute is unambiguous."

As with the em dash - let's not throw the baby out with the bath water.

They can work well when sparingly used and well thought-out, unfortunately LLM use is more on a par with:

‘It’s not mashed potato. Its potatoes lovingly mixed to perfection with butter and milk which quietly dominate the carrots beside them.’

The words are in the right order, th grammar is ok, but the subject is so banal as to undermine the melodramatic style chosen and they often insert several per paragraph.