I agree, workout notes are underutilized. I’ve started using them and it makes reviewing patterns a lot easier.
However, annotations should be included in the weekly view. Annotations make reviewing the data even that much easier. For example, I usually make an annotation to indicate travel dates, illnesses, etc. Basically all factors that affect training quality but are not workout-specific.
First image is what I mean by weekly view. Second image is what shows up when we select a week.