It's the lack of an Aqours equivalent, I think. Closest thing is YoshiMaru but that ship fell out of vogue for whatever reason

I agree that there's no real equivalent ship from Sunshine, but that still doesn't explain NicoMaki's staying power.

Murderes for hire

@Sleepyhead: On top of the picture on the right, opposite side of the tags, hit the button that says "Source" and it will take you to the artist's Tweet.