The treatment community is in general agreement that stress is a frequent factor in relapse. It's not the only factor, but it's a major one.
As far as stages of recovery is concerned, consider the of physiological dimension. There is a stage of acute withdrawal (often very stressful). If this phase is successfully completed there is a post acute withdrawal phase that often results in "post acute withdrawal syndrome" often characterized by large and unexpected emotional changes (which again can be very stressful).
I'm all for a spirited discussion offering information about benefits of any given approach. I think folks can make good choices within that sort of context without the need for disparaging other approaches.
I agree that "Each person who finds themselves facing an addiction is not the same. They don't react to stress the same way". So I think it's best to keep the most vulnerable of them in mind when we post.
For the rest of my life I will reflect on what light is. — Albert Einstein
1 John 1:5 God is light
God does not care about our mathematical difficulties. He integrates empirically.
— Albert Einstein