The black and white aspect of AVRT and the messiness of life are separate issues. Intertwining the two is where recovery as a process has its foundation. Ending an addiction has to do with stopping the continued abuse of a substance. Abstinence is the ultimate solution for abuse of a substance.
AVRT and its methodology is focused on the cessation of an active addiction by committing to abstinence, that commitment does/will lead to unmessing some aspects of life, but as far as that messiness was caused by drinking/using. Life can be messy for/from myriad reasons, allowing the idea that drinking/using is caused by reactions to the messiness is to ,I think, misidentify the cause and at the same time give power to rationalizing continued use/abuse.