I completely agree that the ability to annotate designs and provide further information to developers is critical. About the closest thing I can see that's baked in to XD is pinned comments, and we shouldn't be mixing comments with annotations. In the design view of a prototype, I want to be able to go into an "annotations mode" or something like that where I can drop a pin on to an object on any artboard, have it auto-increment a numeric ID, and allow me to enter an associated annotation. When I'm reviewing that prototype in design mode, I can go to the annotations panel and hover/click on an annotation to see it "light up" on the artboard. Even better would be optional tagging of annotations, so I could filter annotations by tag.
I completely agree that the ability to annotate designs and provide further information to developers is critical. About the closest thing I can see that's baked in to XD is pinned comments, and we shouldn't be mixing comments with annotations. In the design view of a prototype, I want to be able to go into an "annotations mode" or something like that where I can drop a pin on to an object on any artboard, have it auto-increment a numeric ID, and allow me to enter an associated annotation. When I'm reviewing that prototype in design mode, I can go to the annotations panel and hover/click on an annotation to see it "light up" on the artboard. Even better would be optional tagging of annotations, so I could filter annotations by tag.