The main reasons people root are to gain more control over the file system. This means you cab read and write to external USB storage, change your OS, change permissions, backup apps and data without a PC, and more. You can also remove ads from aps. It is possible to also increase the CPU and graphics performance. The Nexus is sitting at the top of the food chain in that department, so it can handle anything you can throw at it.
I'm an advocate of rooting, but many people don't unless the come across a situation where they need root privileges.
Definitely doing the right thing with research. If you decide to, we're glad to help.
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