You've cherry-picked a procedure out of the thousands possible. The reason it's preferable to use a surgeon for things like appendicectomy is because there isn't a technology to do it for yourself or treat it before it needs surgery. There are, however, other treatments available for other maladies that mean you don't need a surgeon or won't need a surgeon, and thus surgeons can concentrate on other stuff that we don't have better, cheaper ways of taking care of.

If AI can take care of parking tickets and small claims, perhaps speed up the process by making lawyers quicker at their jobs et cetera et cetera, then it's all good. If it puts pressure on lawmakers to simplify the law, all the better.