I agree with some of what you wrote (not needing a speech therapist, stuttering doesn't define you, etc.) but I also think you're oversimplifying something that nobody really understands. Why is it that for the first 30+ years of my life I can be completely fluent when I'm alone and then one day start having minor blocks as I'm reading an email to myself. Why is it that I can sing fluently when I'm actually intending to sing a song but might get stuck if I'm singing to identify a song for someone. Why is it that when I'm really pissed off and my adrenaline is pumping I'm usually pretty fluent but when I'm terrified and that same adrenaline is pumping I can barely get a word out? Why do I never stutter when I cry? Why do I stutter when talking to my dog? It's natural for us to want our stuttering to have a simple root cause that we can address. And maybe in some cases it is as simple as anxiety. But, in my opinion, those cases would be the exception rather than the rule. Maybe someday science will catch up and tell us definitively why we stutter. Maybe even in our lifetime. But we may never know. And that's also okay... because what other choice do we have?