Because I don't think I was really receptive to the techniques they taught me such as speaking slow, speaking with a rhythm, pausing during stuttering and restarting, etc. Those techniques while somewhat useful and I still use them sparingly were not very useful in a real-world scenario. Especially as a child. What helped me the most was just building confidence and ultimately not giving a F about my stutter. I would say there were 2 points in my life that showed me that showed me what was possible. 1 was when I made a friend that spoke very slow and spoke almost monotone. But he has this stature and ability to command the conversation even at such a slow cadence. Because speaking slow often lets people cut in and essentially erode your confidence, making the stuttering even worst because you start speeding up and finishing your points much quicker than you want to. By mimicking this friend, I learned how to command a conversation while speaking slowly and that went a long way. Stuff like using humor to defuse insults, being stern yet not awkward when addressing interrupters. 2 was when I had to do public speaking course. Showed me the value of prep time and having a dedicated platform. Nowadays I have no issue doing presentations.