You know what: no. The only person who gets to decide what's best for helping a person cope with their differing needs is that person with differing needs.
But what if it solves the problem of barcoder not understanding stuttering? I mostly agree with you, but in principle subtitles and voice over does the same thing - not everything is so simple.
People being left to make their own decisions about using or foregoing prosthetic technologies sounds rather simple to me.
It's a can of worms. The trouble starts when the problem is solvable and/or doesn't pass to the next generation, and yet some parents insist their children not to be treated, or even to be inflicted with the problem, in order to keep them within the community of other people dealing with that problem.
I am thinking of the children; especially so - of their right to choose.
As a filter that can be enabled in a video player UI, it would act very much like subtitles or voice over - here it is an aid to the consumer and everybody makes their own decision. As a mandated thing for all stuttering content it's limiting freedom of expression and is bad. My point is that it is not black or white, and it depends how something is deployed.
If that was the case, we wouldn't need psychologists, would we ?
Then we can accept there's not an ML solution for it, since sufferers haven't built it yet.