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.