Where is the protection.....
The cord and plug is not idiot proof, jmho.
I agree that it's not idiot-proof, but I'm not sure that it matters. How many threads have you seen here and on other forums where chooses (or advises someone else) to do something blatantly foolish with electricity or electrical connections in the name of audiophilia? How many times have you heard some audiophile say that the NEC is too cautious or just plain wrong? Way too many times, I reckon. Make something idiot-proof, and a more resourceful idiot will come along.
Anyway, the saving grace (pun intended) is that there are almost no consumer audio products that actually need more than the rated power of a 15A convenience outlet. The few that do that I'm aware of have hard-wired power cords. You'd have to saw off the factory plug and put a NEMA 5-15P on there in order to plug it into a 15A outlet.