If it is at all possible to replace a lawyer with an LLM, it should always be the preferred choice. Using a lawyer is not a zero-sum game, using an LLM is.

Lawyers nearly universally tend to: convince clients they need a lawyer; promote extreme views; charge legal fees (that ultimately result in financial damages to the client). There are no winners in this game, except for lawyers, who are having a lovely time. Even if you won the case, you've lost, because the pie got smaller due to lawyer fees.