Speech therapist here—people tend to think stuttering is about coordination of the lips tongue and vocal cords, but it is really about being able to manage the cognitive demands, (including short term recall and working memory,) sentence formulation ( including word/vocabulary retrieval, grammar and thinking of what you want to say,) anxiety, and motor skills of the lips , tongue, palate, breath, and vocal cords in correct sequence.). All of those facets have to come together to smoothly and efficiently speak. Children typically don’t begin to stutter until after age 3 or 4 because they don’t start to use full sentences until that age. The complexity has suddenly gotten greater and stuttering occurs. When the child begins to get self conscious about stuttering it gets worse. Anxiety adds another layer of difficulty to speaking. OP’ s therapist learned through assessment that OP had difficulty with word retrieval, so she addressed the issue—reducing the complexity of talking. No one approach is right for all people. Working on word retrieval of vocabulary has been unusually helpful for OP. It may or may not for others. Either way it’s useful to know the many factors at play in order to speak fluently.