For those that like it (and I've known quite a few). Well, good for them!
But that does not negate the fact that - you are right. AA does not have scientific backing. There is no reason to recommend something that we have shown, does not work.
Tell Doc B do they believe in 'evidenced-based medicine?' (that's a dumb rhetorical question.
Then hand them this: https://www.theatlantic.com/magazine/archive/2015/04/the-irrationality-of-alcoholics-anonymous/386255/
If you feel as though you need additional support - get it. If you feel as though you could benefit from therapy - meet with someone. If you had liked the companionship of AA - well, sure. Go there.
But you don't have to do that to ensure your sobriety.
Doc B doesn't know what they are talking about. 
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