MANY current plugs have blades with different widths for Hot and Neutral, and so they only fit into the outlets (also with different slot heights) one way. BUT what is also less obvious is that the new wiring system forces reliable connections at every outlet regarding the polarity (that is, Hot versus Neutral) of the slots in the outlets, AND of the way that user devices are plugged in.
Having proper Grounds at every outlet that ARE connected by a bonding wire in the cables to a true Ground at the breaker panel is important for removing small electrical noise signals as well as the safety factor in the design. Ungrounded outlets are the root cause here, but not just because of grounding.
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