Stuttering on purpose is a common technique used in many methods throughout the world. Every speech therapist I've been to has mentioned it. Rather than an experiment it's just a common method of speaking as a person who stutters. It's like someone suggesting to hold a tennis racket a certain way in order to improve how said person plays at tennis. But in this case, it's helping a person who has trouble speaking to do so. It's not about fluency, it's about being able to get the words out, and generally stuttering on purpose can help to do that. I agree though, practice is important. But *not overthinking* is also very important. It has been known to make things worse to do so. Constantly observing your speech and thinking about what you are going to say is one of the leading causes of word avoidance and word substitution, which will only worsen the situation if that path is taken. Practicing in the job itself is the best way to do it. You're in the mindset to get things done efficiently, therefore there's not much time to over analyse. It's the "deep-end" technique. It's human nature to adapt and learn better under pressure. I'm not qualified either to tell the OP how he/she should approach the situation, I'm just going by what has worked successfully for me and others.