GoTorankusuKu: The answer to that question should be obvious. #1, people make mistakes. Why use a calculator? Why use a remote control? Because it is easier and less prone to mistakes.
#2, why waste the time installing it by hand? Sure if ya wanna do it that way, more power to ya. But for those that don't, I wouldn't call 'em lazy(although I fit into that category for many other reasons), I call 'em people that don't like to waste time.
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