I think you are asking too much out of this classification. The classification is useful to look at DNS from a "user" perspective, not from a "dns troubleshoot

I think you are asking too much out of this classification. The classification is useful to look at DNS from a "user" perspective, not from a "dns troubleshooter" perspective. Tools like dig, zonemaster [1], etc. are out of the classification's scope. Oftentimes they can do everything DNS and hence fit none and all of the categories. I would call those "DNS powertools" or something like that.