I'm not sure how you've come to the conclusion that a Graboid rush is much more like a duo than a mono because of "balancing issues". It's obtaining 1
per turn from its mark; in what way does this present a balancing problem for the rest of the deck? Just because you're unable to create a Pend/Pillar split? That doesn't make sense to me.
Let's look at this Animate Weapon debate from another perspective. Animate Weapon is supposedly supposed to be considered of the Other Element because it doesn't use any specific quanta. The question is: Where in Elements do we find this Other quanta? Wouldn't it be true that Animate Weapon consumes a specific quanta type depending on what Elements are put into your deck? This effectively means that sticking a Nova in a deck with Animate Weapon causes the deck to automatically become a Rainbow. The same could be said of any deck using Cremation, Quantum Towers, etc.
On the subject of Nova, why should we stop at quanta consumed? Why not also factor in quanta generated? It's a common misconception in the current system that a card such as Nova is of the "Rainbow Element" because it produces 12 different quanta. So why should we make the categorization only based on quanta consumed instead of quanta generated by the deck when it makes just as much sense? Or better yet, why not form a system which uses both? If we were doing categorization based on quanta generated/a combination of the two, then the second deck would be considered a Quartet because it's also producing
,
, and
as well
. It's not so simple, is it?
Now, why have I bothered asking these ridiculous number of questions? Because I want to make my final point: Based on what I've stated above, which system of categorization would be simpler to use? I'm not asking for which one makes the most sense, but for which one would lead to the least amount of confusion among users when posting their decks in the forums. The current system is both practical and straightforward: You simply count the number of colors you see on your deck screen and then put it into its appropriate section. I don't know how it could be any easier.
To echo my thoughts, I've dug up this quote from a past discussion on the current categorization of decks when the current system was first put into place:
You don't understand properly. Using skills and activated abilities is irrelevant. The casting costs of your cards are irrelevant. The quanta your deck produces is irrelevant. The quanta your deck uses is irrelevant. The colors of the cards you end up with in play or even in your hand is irrelevant. Literally EVERYTHING is irrelevant except the colors that show up on the cards when you click them into your Your Deck screen.