That's exactly it -- I didn't.
I previously had hybrid cards placed where their primary home was. So for example:
Rakdos Cackler was Red.
Dryad Militant was White.
Judge's Familiar was Blue.
Deathrite Shaman was Black.
And on the other side of the equation, I had:
Figure of Destiny was Boros.
Kitchen Finks was Selesnya.
Murderous Redcap was Rakdos.
This was done for a few reasons, namely:
1. Precise color/gold balancing only benefits the cube's curator. There's actually little value in having colors / gold cards at exact amounts from a gameplay value. It's largely an aesthetic consideration that mostly exists because we as humans like symmetry and we're confronted with the visual organization of popular cube curation websites like CubeCobra and CubeTutor that further incentivize us on a psychological level to maintain a high degree of rigidity/balance in our color balance.
2. Hybrid is more "playable" than even mono-colored cards. Hybrid cards, from a gameplay perspective, can be treated as mono colored cards that can just incidentally be easier to cast or be used in additional decks than beyond their primary purpose. If you want to maximize playable/draftable cards in your cube, being a hybrid maximalist is a good strategy.
3. Gold slots are the typical cube's most competitive slots. Gold slots can and should be limited as much as possible in cube for balance/gameplay/drafting purposes, and so they tend to be some of the most precious slots in cube. Putting hybrid cards outside of these slots where feasible is not only reasonable from a gameplay perspective (a mono white deck takes no issue with
Dryad Militant being castable in a mono green deck) and allows the excitement that is associated with multicolored cards in the eyes of many Magic players.
By putting cards where they were most played, I thought, I'd be making an overall better cube experience. The number of high-power hybrid cards in each color pair are even more drastic in their imbalance than gold cards, so making dedicated "hybrid" slots would only exacerbate issue number 1 up above. I wasn't wrong, necessarily!
A compromise position that I've seen made on these forums and elsewhere that I'm a big fan of is a general "hybrid" section, where there's 10 or 20 slots or whatever that are just hybrid cards of all sorts, since they're realistically closer to artifacts than gold cards in terms of ease of casting. There's no color balance to worry about here, for that reason and for the previously stated "not all hybrid pairs are created equal" point. This seems very smart to me.
However, I decided in 2019 that, at 720 cards, I wanted to make things simpler for myself. This happened after the second or third time having my cubers sort the full cube after a draft when I knew I needed to make some changes, and each time, there were "mistakes" and too many questions from my drafters about where cards belonged. Even I had to constantly refer to my online cube list about how I had categorized cards, and when I compared my cubes to others online, I was constantly confronted by my own inconsistency in how the cards were evaluated. None of this a big issue, to be fair, but neither was the loss of two or three cards that would come from saying "if it's BR put it in the Rakdos section" for both my sake and my drafters'.
The cards that ended up leaving cube as a response to this were
Judge's Familiar (I had just really wanted a blue 1-drop that I liked),
Deathrite Shaman, and
Sygg, River Cutthroat. Sygg was in black when it didn't have the wealth of 2-drops that it's gotten in just the last two years and moved to Dimir with the change, and was then cut last year, but he would still be in cube if I had a dedicated Hybrid section as I adore the card.
To be clear, from a design perspective, I think my approach of putting hybrid in gold is objectively worse. A "hybrid section" or "put cards where they're most played" evaluation are both equally valuable in my eyes, and I'd probably give the "hybrid section" strategy the nod as my favorite from an aesthetic perspective. The one advantage of my "put hybrid in gold" approach is that it lets me cut down on the total number of gold cards in practical terms while still including a lot of "sexy" cards, so I've got that going for me! But, after writing all this, I've basically talked myself into a hybrid section...so we'll see what happens there.
In summary:
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