Mildly Infuriating

I covered that. Different rating. That 15A cord will survive a 20A fault. Its rated at 15A because the voltage drop will be out of spec at 20A draw, not because it will be a fire hazard at 20A. You will be able to get enough current through that 15A cord to trip the 20A breaker. You might not be able to get 20A through a 5A cord before the cord catches fire.

ANY cable being driven above it's rated load is a fire hazard. There healthy margins in those ratings, so going slightly over is likely not going to have any affect, but those margins are for good reason (namely people like you thinking it's fine to plug a 15A cable into a 20A circuit without external fusing or current limiting), and deliberately overloading any part of an electric circuit is ALWAYS dangerous and stupid. And what about 7A cables you can get in japan ? you can explicitly get 0.75mm² cables, which are only rated to 7Amps. Just as confident of blasting 20A through those ? Almost 9 times the amount of waste heat being generated in the core than at it's max rated load.

My point is that UK appliances are specifically not designed to trip UK breakers in a fault. US devices are.

In every jurisdiction where fuses are not required in plugs, appliance standards require the appliance to be able to trip the household breaker. This is a fundamental concept of electrical safety.

Nope, again completely untrue. Breakers are only required to trip if the circuit becomes overloaded.

Your breakers don't, and can't give a shit about what's happening on the other side of the outlet.

Your device could slowly be melting itself into a pile of burning plastic, as long as it's drawing less than 16 Amps to do so, the breakers will not trip. As I've pointed out, repeatedly already, and you have repeatedly ignored, breakers are solely and exclusively for protecting the wire from overheating /overloading.

And in fact, the fused plugs actually make it way MORE likely for something to trip on a device side fault in the UK, because the current only has to be like 3Amps to kill the fuse. In every other place of the world, current needs to be at least 16A before anything trips.

That's actually false. You're conflating the resistance of "skin" with the resistance if the "body". Once you burn away that skin, your internal resistance drops substantially.

I address that point, quite literally, in a later a paraph where I write

Maybe an amp or two if you stick electrodes inside yourself

So what happened here ? Did you not read my comment ? Did you not understand it ? Or did you read it understand, and then continue to pretend like I haven't already explicitly addressed this anyway ?

At this point I think calling this behaviour accidental would be an insult to your intelligence, and just have assume that you know exactly what you're doing, and are knowingly and deliberately arguing in bad faith and with intellectually dishonesty, so stop. Just go away. I'm done. You're either fully incapable of, or unwilling too, engage in honest debate, so I'm not linger interested in continuing this.