Just imagine how much man-hour, money, and energy have been allocated to actually turning emojis into a race and gender problem. And next to that is all the mental overhead for people when they want to use these emojis with different skin tones and genders these days.
Truely we've became a race of bureaucrats and "artists". Unfit to do any productive work.
Not even yellow. Monochrome. The characters shouldn't have any color specified. There's no need for a separate character for black A, yellow A, green A. Why should there be any for emoji? All of them were originally monochrome. A separate markup language (e.g. CSS) could be used to assign them any color or style.
True, but there is the family emoji which is a man, woman, child emoji joined by a UTF ZWJ. That wouldn't be possible then.