But the real question is 1) whether other human lawyers would catch the error 2) in how much time 3) which of the errors introduced by AI vs. human would have bigger consequences. On 1 and 2 the answers are very likely to be "yes" and "it would take humans more time", but the question that really matters is 3.
Adversarial agents and reviews means 3 is very clearly giving the benefit to AI.
Let's face it, only thing lawyers are there for right now is to take liability. And even that may not be needed 5 years from now.
Middlemen that can be automated will be automated.
Lawyers do a lot more than accepting liability. In my field they spend a lot of time on contract negotiation, and on interpreting what federal and state regulations actually require us to do.