Imbalance of colour combinations is getting worse

Pylgrim

So, I recently updated my Best Characters for each Two Colour Combination thread. It's always been well-known that there's a big disparity among colour combinations, some being extremely common, while others are exceedingly rare. Well, updating my thread made me realise that not only Demiurge has failed to address the disparity, it actually has become much worse in the past 6 months.

Here's Nonce's famous table of 2* and above characters grouped by complementing colour combinations (which I updated with the latest releases). You can clearly see which combinations are seeing very little love. (Fun fact, the "top 10" most popular combinations include almost 75% of the existing characters, while the "bottom 10" only have a bit more than 25%%):

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Let's take a look at a rarity breakdown:

2*

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3*

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4*

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2* and 4*s are understandably underpopulated, as they combined have as many characters as the 3* category. But look at the disparity just in the 3* category, which never will be solved as devs have stated that there will be no more 3*s. Nevertheless, that in itself is not that big of a problem, as you will always play with three characters so you don't need to try to complete your rainbow formation with only two characters. You just need each character, in average, to contribute two colours. But it is those two colour combinations where the disparity is more outrageous! (separated by rarity):