Yet one more item in an endless exhibit of how mankind is unable to standardize anything at all. Get TWO engineers together to agree on ONE standard plug and the assholes will come out with THREE separate plugs, completely non-compatible with each other, of course.
It's almost like a miracle that we got the world to agree on certain things like time and timezones, a system of coordinates, the metric system.
All of them received initial pushback, and some to this day. Noisy, noisy fucking humans.
Did you know that for a few decades, every town in the UK kept two different times on adjacent clocks? Back when their railway grid was expanding everywhere. Local time and London time.