Bad legal advice will keep you dealing with the legal system for much longer and at much greater cost. Something being cheap and quick upfront doesn't mean it will be cheap and quick by the end of the process.
I think you are ignoring that there are bad lawyers and they give bad legal advice too
Even the good ones will not step above and beyond what they are paid to do
but an AI ? it will and can go above and beyond
But isn’t this study saying that the legal advice could actually be better with AI?
A bit of extrapolation from the study, but not a crazy stretch.