Post-war reconstruction, they had a massive copper shortage. The wiring standards they adopted allowed for using as little copper as possible. That meant fewer, high-amperage circuits, rather than many low-amperage circuits. They used “ring circuit” topology instead of “branch circuits” to allow them to use undersized wiring.

Basically, all the shortcuts they took in their household wiring introduce considerably greater risks than exist elsewhere, including North America. Their household wiring is overloaded relative to most of the rest of the world. They mitigated the risks of their household wiring with stricter standards on their appliance wiring. Which is why they need a plug for their phone charger comparable to the plugs we use on a welder.

It’s a good plug A damn good plug. It’s just complete overkill for electric systems outside of the UK.