Ehhh, Steven Universe borrows that from late 80's- early 90's anime, and the mouth, nose, and face shapes appear to be a minimalist style version of Hayao Miyazaki's work.
I mean I love Steven Universe, don't get me wrong, but it's clear that Rebecca Sugar had some strong influences on her style.
So, to be fair, it's hard to be 100% original with any style, but I ultimately agree... I'm sick of seeing the same old thing crop up so much. It's especially awful to see anyone just copy a style. That's an artist's heart and soul right there, at least try to put your spin on it. D: