Unless I'm missing it, I don't see where you can add tags to product notes, but it would be useful to be able to do so (as long as those tags fed into a way to search or display content based on the tags).
Notes have a wide variety of functionality for users to create documentation. It's also possible to set hierarchy of notes as a way to organize notes.
At this time, based on current priorities and community feedback, we are unlikely to make updates in this area. We hope you can understand.