Why tablets use Nav Bar? Advantages?

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http://forum.xda-developers.com – Why would the next Nexus 7 continue with the NAV Bar? (Soft back, home, recent apps) I owned the Nexus for a while and couldn't stand them. You get alot more room with other 7 inch tablets without Nav Bar. New 7" Galaxy Tab 3 as a great example. Just wanted to get some thoughts. (HowTos)