At one point the Annotation feature in Dev Mode allowed me to add an annotation to a frame, and when I copied that frame the annotation would be copied as well. This doesn’t seem to be working for me anymore. It was extremely nice when it did, because I often copy frames either to make a new iteration, put a copy on a different page, put a copy in a different file, build out a user flow, etc. and having to remake an annotation over and over is hard to keep track of.
Personally I need annotations to be connected to whatever I first put them on until I specifically delete it, but I can see how this could be annoying extra work for people who do not need that. Maybe this could be a setting, where you check on/off whether you want annotations to duplicate or not.