Only on one occasion, it seems, someone has had any confusion about how tag badges work.
Does that mean this feature is strikingly crystal clear compared to other aspects of the site, which generates dozens of questions?
Or is this a somewhat "invisible" feature that few discover? From my experience it looks like they only work for late-game gamification, posing another goal very active users can aim for. Does that reflect the intended usage of tag badges, or is there something special about the tagging situation on Space.SE that causes this to happen?
For programming oriented sites, for instance, most questions will be tagged with one of a few popular programming languages, with most users specialising in only one or two of those.