exactly. it's not necessary, and it's not for the average user, or even more techie/geeky user, really.
but for those of us that really like to tinker, necessary's got nothing to do with
basically "root" is to *nix OS what "administrator" is to Windoze. For 93.624% of the population, rooting their phone shouldn't be of any concern at all.
The draw of it, besides the power user feeling, is getting rid of uninstallable apps, tweaking system settings, and probably most popular, installing custom ROMs, like the popular Cyanogen ROM.
Basically, installing a different flavor of OS, or merely stripping down the Android OS to it's core, vanilla version (think original Droid).
Kinda (well, exactly, technically) like trying out different Linux distros.
But, as far as "needing" to do it...probably very few instances where it would be "needed"
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