I am not saying this to be mean, because these feel like good faith questions. But they also sound like questions rooted in a purely logical view of the world, divorced of experience.
That is, I don't believe it is possible that you've had real world experience with alcoholics, because if you had, it would be obvious why it doesn't work the way you are asking about. Some addictions are just too powerful. It is not a matter of having failed to treat the root cause. It's a matter of acknowledging that, for some people, the only solution to alcohol is not to consume any. It doesn't mean they don't also try to treat and understand deeper emotional reasons for their drinking.
There's lots of research that points to that the brain after addiction just isn't the same as before addiction[1][2]. So while there might have been a root cause before, the effects of addiction is still present even if the root cause isn't an issue anymore.
That is, I don't believe it is possible that you've had real world experience with alcoholics, because if you had, it would be obvious why it doesn't work the way you are asking about. Some addictions are just too powerful. It is not a matter of having failed to treat the root cause. It's a matter of acknowledging that, for some people, the only solution to alcohol is not to consume any. It doesn't mean they don't also try to treat and understand deeper emotional reasons for their drinking.