Sure, it's a great system. It just happens to fail the vast majority of clients. This idea that fluency works and if it doesn't work it's because people simply aren't working hard enough is just false. It doesn't work for the majority of people because it's not an effective approach for the majority of people. It doesn't address (nor does it understand the issue of stuttering).  Plus a system that claims credit when it works but casts blame when it doesn't isn't a good system.