There is a great possibility this is meant for herd chat. I’ve just realized that in the past this was more of a place for theories and the like so I put it here.
This is the post to comment your theories, headcanons, opinions are characters, all that <3 I thought we could use this lol
oof, I'm late XD I have a theory that when black foals have their own foals, they don't pass on the starfire, only the rare black coat, so it's a dominant gene, like gray in horses. (I have a post on this in Misunderstood VIllains that explains it much better) and so over time, the black coat becomes more and more common. Not super common, but common enough.