John, I look at the rating of the outlet (in particular) not as how much load it can handle, but at what devices it ALLOWS to be connected to it.
Using the logic of a higher rated plug is better on a lower rated circuit, then we could put a 30 amp plug on a 15 amp circuit. How about a 50 amp plug on a 15 amp circuit? Does that make the light go on? It would let you plug a stove into a circuit that was using 14 ga wire.
By only allowing a plug of equal or LOWER rating on a circuit, you a assuring that no one device can overload that circuit.
I understand the confusion on not allowing a 20 amp SWITCH on a 15 amp circuit, but I believe that the definition of a switch is much broader than your typical wall switch. I believe that it includes devices that also allow things to be connected to them (think of a hot tub switch). Again, you wouldn't want to put a switch that allowed a 30 amp device to be connected to it, on a circuit that had a lower rating.
I hope I added to your understanding, just trying to help. Keith Williams
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