One of the few things I can currently see GPT do well is helping find legal precedence. Rather than having five law students roam through old cases, it would make sense to feed 100+ years of legal rulings into the model and then query the AI for any previous rulings similar to your own, with the desired outcome. That would allow lawyers to state question like: In cases like this, which evidence or arguments caused the ruling to favor the accused.

You still need a human to make the case, present the arguments and adapt every to the current situation, but there's no reason to have human search through thousands of cases and write summaries, not when an AI can do it in an instance.