I share the sentiment. It's one of the issues when you don't know what causes something - it's hard to know where to even begin. And you can't work on solutions until you know what the problem is. The psychological similarity of stuttering to other 'habits' means this one might be mostly on us to work through ourselves and take a lot of personal effort, like managing chronic illnesses or processing emotional trauma. Sadly we can't engineer convenient solutions to everything. :(