In 2018, I had the same thought as you. This has led me to complete a neuroscience degree to understand what the fuck is going on, why have we not cured stuttering yet? The issue here is in the word "cure". Lets think about other disorders like parkinsons disease, epilepsy, ADHD, schizophrenia, etc etc. All of these disorders have no cures, yet they all have management strategies. These management strategies like medications address the underlying physiology and lead to improvements in their symptoms. This is completely different from an outright cure. People with these disorders need these medications, otherwise their symptoms will re-arise. The epilepsy person will have seizures without their medication, the schizophrenia person will have hallucinations without their medications, etc etc. This is all to say that we have essentially not really cured any disorders of the brain from existence, so we can't have that same expectation towards our disorder, stuttering. Now let's use that framework to discuss stuttering. Stuttering is no different. There are mechanisms going on in the brain that when we address them, this typically leads to fluency. One of those mechanisms are increased levels of dopamine in people who stutter. Studies have shown that reducing levels of dopamine typically leads to increased fluency and serves as a management strategy. However, there is nuance and some people don't respond to decreasing dopamine, they respond to increasing dopamine levels. We can say that we don't want to be taking medications for the rest of our lives, but there is no other way to reliably attack a mechanism in the brain other than medications, unfortunately, this is just reality. I may make some people angry with what I'm about to say, but here it is. We don't send the Parkinson's disease patient to a physical therapist to address their underlying physiology just because physical therapists deal with movement disorders. Let's address the underlying physiology and we will see improvements.