Any reason NOT to root brand new GNEX?

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http://forum.xda-developers.com – I'm receiving a new Galaxy Nexus in the mail today. I'm new to the Android world but this site has been extremely helpful in explaining the capabilitys of this OS. Since I've never used Android I don't completely understand the pros/cons to rooting my device. A lot of posts say "you have to do it to understand the benefits" or something of that nature. I understand that once you root you can change your ROM, kernel, navigate all file folders, use certain apps that require superuser access, etc. As of now, I'm not sure I'd want to do any of that. I may want to in the future when (HowTos)