I’m convinced that not everyone with a stutter actually wants to end it. I once had a boss (for too many years) who stuttered quite significantly. But he had three different levels of stuttering. He had minor difficulties with his bosses and would talk on without aa problem if they would complete a word for him. With his peers, he would not allow them to complete words for him, but he would have minimal delays. With his subordinates, he would stutter uncontrollably, and continue stuttering even longer if anyone completed his words. I’m convinced it was his way of controlling us. He would go into an Ak-Ak-Ak-Ak.....mode with the top of his tongue curled out for what seemed to be minutes on end. He stuttered so badly, that one (three level down) subordinate, who rarely ever heard him speak, thought he was having a heart attack, and began starting CPR.
My son use to stammer on some words as a child and had some nervous physical ticks (stretch his neck and arm), but outgrew them. Or so I thought. I see him once in awhile back from college and he stutters again. Not much - but a little. But - he gets good reviews in his jobs where he is holding group meetings and getting presentations - so hopefully he doesn’t do it there.
Maybe he is stressed out over college (I doubt it, he gets great grades without much studying), or perhaps he is nervous around mom and dad now that he has been out of the house for almost 4 years.
He did turn 21 and has started drinking. I don’t think too much, but I might need to look into that if drinking could bring it back on. I could see where it might.