My sense is that the confidence interval is not something we want to control in the UI: It's the kind of detail that is best left for the user to tweak in the notebook.
For the reviewer:
Does a short comment in the UI (where we want to avoid distractions) and a longer note in the notebook (where we want to really explain things) make sense?
Do you think explanation is needed anywhere else? Could add a comment to the graphs, but I'd worry about clutter.
For the reviewer: