I do, but still think you're oversimplifying the issue and relying too much on the psychological aspect and the power of positive thinking. As an example, why does CBT for anxiety not improve stuttering? Maguire, G. A., Nguyen, D. L., Simonson, K. C., & Kurz, T. L. (2020). The Pharmacologic Treatment of Stuttering and Its Neuropharmacologic Basis. Frontiers in neuroscience, 14, 158. https://doi.org/10.3389/fnins.2020.00158