Why did the man who created the animated hit decide to walk away?

Within the article it goes on to say that the reason that he stepped down from making the tv series was that it was driving him crazy. after almost going homeless to one of the most famous tv show creators. it seems that it would be the life but I guess not. I guess that it can be harder then it seems. In my opinion I can see how walking away and backing down can really help and be for the greater good of him self and the tv show. He is not completely got and out of the picture be just simply a writer. And that seems like a more stress free life to me.