I've wondered about this a couple times, and seeing Essence's decks with their many useful tags reminded me of it. Would it be worthwhile to add tags to the topic titles of duo and trio decks, specifying what elements are used within? Personally, if I am looking in the Duo or Trio sections, it is because I am wondering: "has anyone made a good combination of X and Y elements?" or "I really like darkness. What are some of the elements people are successfully combining it with?"
If it is feasible, I think it would improve the usefulness and accessibility of those sections. Thoughts anyone?