Advantages of rooting a nexus?

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http://forums.androidcentral.com – I always thought the advantages of rooting (non nexus devices) would be just to get the latest android software on your device since it never got the latest updates. With nexus, updates aren't a problem. So what would be the advantage of rooting a nexus 4? better battery life (if so, how much)? changing the look of the notification bar and on screen buttons? i apologize for my ignorance, but i would like to learn. thanks. (HowTos)