You're thinking of pre-LLM times. Nowadays GPT-6 can probably advise them better than all the worlds law firms combined. And probably win too, considering the incompetence (and tech illiteracy) of human lawyers.
Have citations of case law that doesn't exist been addressed? It seemed like that kind of outcome being punished might make people less likely to try relying on LLM output for legal situations without an expert human performing a review.
Optimistically assuming you can do a lot of stuff well with GPT-6 in the legal space, its still going to be a lot of money - 1. Various court fees may still be thousands 2. You still will likely need to have at least _some_ legal representation. Not as much as before, but still thousands of dollars worth 3. You need to pray that your non-legal brain can catch any issues, both strategic & tactical, that GPT-6 produces because X's lawyers will be happy to pounce.
A problem right now is that GPT-6 is just a chatbot, and wouldn't be able to file any counterclaims (which involve human lawyers and billable hours) when fElon decides to wage a battle of attrition in the courtrooms.
Advice? Maybe ballpark quality if you can avoid hallucinations. The legal connections that will help net you a win, certainly not.
You presume opposing counsel isn't using GPT-6 and other, legal-specific models trained on data ChatGPT will never gain access to. Hint: they are.
Regardless of advice quality, legal proceedings aren't free-to-play, and the adversary in question here has bottomless pockets.