Having recently paid a lawyer a bunch of money for a divorce, I expect it's a bit of a double-edged sword. They benefit from clients not wanting to waste time and money peppering them with useless questions and updates, but at the same time a legal proceeding is kind of like a disease— the longer it goes on the worse it gets, and so there is benefit to everyone in being able to get questions reliably and conclusively answered early in the process. A model where you were paying for an end result could well provide better end results, assuming the service provider (lawyer) still retained some mechanism to protect themselves from becoming their client's emotional support system.