SLP here and you are right. Current therapy practices are a bandaid. It honestly is a life long commitment and you probably won’t ever find one strategy that gets you through life. Some of it can be attributed to not working with a fluency knowledgeable therapist, but that isn’t the whole picture. HOW you stutter can change as you get older and as a field, we don’t really know why. Sure, there are theories and preliminary research, but it doesn’t give us the full picture. Maybe it’s hormone changes. Maybe it’s a side effect of neurological aging. We honestly don’t know, but I assure you advocates in the field are working really really with other disciplines to be better at supporting people who stutter.