Thanks for starting this discussion, and I enjoyed reading your post.
As a shift worker, I have issues setting up my sleep coach. My rest days change and don't have weekends. I just have to put something in just to continue.
I wish the whole app was more customizable, which I'm sure this is possible if the developers bother to take their time to develop the app.
This is just one example that I have come across, but im sure there are more depending on your circumstances.