The AA book says "Do not be discouraged............." Why would I be discouraged? The only time I became discouraged was when my own selfish needs were not met. I am hardly ever discouraged these days because I consistently work with newcomers.
The context of the book is referring to the working of the steps.  It also says "No one among us has been able to maintain any thing like perfect adherence.............."
It does not say no adherence. Perfect adherence- no. Adherence- yes.I found that it applies to every single aspect of my life.