UK plugs make the best caltrops. They're huge and most stable with the prongs facing straight up, unlike other plugs that tend to lie with the prongs horizontal. Perfect for "Home Alone" style misadventures. They do have some good things for electrical safety: the long ground pin and shrouded line/neutral pins work well, and the shutter activated by the ground pin is quite a good idea that depends on the longer ground. US NEMA 5-15 has a long ground pin, and shuttered outlets are available, but the contact points for line/neutral are a bit far forward for shrouding to be reliable. The fuse in the UK plugs is a hack to work around the horrible "ring circuit" idea.
As for battery fires, I suspect a big portion of the problem will be numerous devices that don't comply with any safety regulations whatsoever. Until Amazon, Walmart, Alibaba, and such "marketplace" sites are held responsible for the products they sell (or allow others to sell on their sites) unsafe crap will keep getting sold, and some fly-by-night all-caps six-letter shell company will take the blame and disappear. My employer uses LiFePo4 cells due to safety risks (automotive product), it's not the nicest chemistry to use (the V-I discharge curve is nearly flat, then the voltage drops precipitously, so determining the State of Charge (SoC) requires a Coulomb counter which increases BoM cost and charger complexity). With Li-Ion you can estimate the SoC from the voltage well enough, the energy density is higher, the power density is higher, the over-charge prevention and over-discharge prevention circuitry is simpler, it just has that pesky "vent with flame" issue!
