How specific should our tags be?

Question

Many of our tags are aimed at covering broad, general categories, rather than using more, specific tags of limited scope.

For example, we have

• modifiers instead of array-modifier, mirror-modifier subsurf-modifier, etc.

• file-format instead of obj, fbx, collada, etc.

Is this good or bad?

Would it be more useful to have smaller, more specific tags (e.g. knife-tool)? Or is there current strategy better? And if so, why?

If smaller tags are more useful, how specific should they be?

---

As an example on another SE site, GD has many specific tags referring to a kind of tool or file format.

_{I couldn't find a good way to search for "specific tags", but if you poke around you'll see tags like jpg and pen-tool.}