Re: Why was this system even implemented in the first place?
Al Gore and the hanging chads fiasco.
Following that the US government came as close to forcing every state to use electronic voting machines as it could. For my money, ballots with the two black markers where you have to scribble the thick black line and then run them through an optical scanner are the optimal combination of speed and tracking possible. Completely handwritten ballots would be more secure, but kill processing time.