I'm a massive newb when it comes to phones and tablets (mainly because I don't have a need for them when I have decent pc).  After some research I realized it's a massive pain to reinstall a new operating system on a phone/tablet comparing to a pc.  why is this?  (atm i'm thinking of deleting the android on nvidia shield tablet and installing windows 8 on it, since I dont know how to do pretty much anything on a tablet).  Is there any benefits of making it very complicated of changing OS on a phone/tablet?  
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