Einstein was brilliant!. Of course, he did not create the rules of the universe. He was just trying to figure them out! He helped shape, not only our understanding of the universe, but how to go about thinking about things. Just like Newton's theory breaks down in certain limits, so may Einstein's but that doesn't lessen his contribution. Any tweak or replacement of Einstein's theories must still recover most of his predictions which have been proven robust. Just like Einsteins theories must recover Newton's predictions in certain limits.