According to my local addiction services, who are completely independent of AA, resentment accounts for 40% of relapses.
Now to me the way a lot of people in AA talk and looking at the 12 steps you would think its only reason for relapse.
I believe most people are capable of recognising what their triggers are. I sometimes think in AAs attempt to label everybody as the same it comes across as making the problem magical, people changing their behaviour to avoid drinking without it actually being personally relevant.
I remember a friend of mine sharing how she though it might be wrong to celebrate crossing the finishing line of a marathon because it was egotistical. Sometimes I think what's AA trying to do create androids!
I will say I do think AA offers a good strategy for dealing with resentments for many people.
As much as I criticize the big book I would like to also thank Jim in post 22 for posting why AA is in many ways such a fantastic organisation