Similarly, in Ireland where we run 230VAC single phase, three phase 400VAC allows up to 22kW to be delivered, which is about to become extremely useful as we migrate to electric transportation.

Also, on safety, I don't know the statistics, but subjectively, electricity feels much more dangerous in the US because of the plug and socket design.

Refer my comment elsewhere in this thread, but I suspect your belief that '120 is safer than 230 or 240' is misplaced.

F.e. standard USA circuits are 15A, IIRC. In Australia, in contrast, it's typically 10A.

Hence, Australia's safer than USA - though realistically any amount of current is fairly unpleasant.

That's not how ohms law works.

The current is determined by the voltage divided the resistance.

The current that flows during a shock would not be limited by breaker size in any country -- you'll be long dead by the time 1 amp flows.