I am old enough to remember about 11 different mains outlets in UK. Things evolve and, if fit for purpose become a standard, either by law, 13A pugs, or by common practice, XLRs for mics etc. (there was a good dozen types of those 50 years ago)I'm not an EU supporter, but USB-C chargers are most welcome.
I wonder if an even better idea will come along, once were tied to USB-C.
I have no doubt a better mains outlet or mic connector could be designed but the incumbents do the job admirably as does USB C and now it is a standard here it will stay.
I ONLY posted about fekkin plugs! I will have no more truck with climate change deniers.