"Is there REALLY only a one size fits all approach to sobriety ?"
Of course not and proven here.
What I've seen in the people here who have achieved sobriety, no mater what method, is footwork was put in to change.
And also proven here that doing nothing doesn't work.
Working with another alcoholic can become frustrating. It's not the easiest thing to listen to someone not putting in any footwork to change, not using the suggestions given, and doing the same thing over and over thinking the results will be different.