At least the American rating system doesn't cover a good chunk of the front cover and art. I can't buy games in my country because of these huge stickers printed onto the cover, often shifting art and text/title. Imagine having a dark and grim cover like Darkest Dungeon and then a happy-green logo on it. On Breath of the Wild they decreased the title text's size a good bit because of this.
So kudos for that small black and white rating image you guys have.
And for clueless parents these rating systems are at least some guidance.