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Thanks for the explanation. It is not really something I want to do. I am a 'vanilla' person. I was just interested why people would go thru the trouble of replacing the ROM.Generally for additional features, improve performance, battery life and the ability to add themes etc.
Unless you do something silly like use the wrong recovery or try to flash a non N7 ROM on to the N7, chances of bricks are pretty slim.
Is it something you're thinking about?

That's a good enough reason.Just want to learn new stuff.