... and reportedly some isolated remote parts of Norway, Spain, and Russia still on the pre-war 220/127 system with line-to-line power.
As are some areas of Belgium and Germany (mostly suburban Berlin). I am pretty sure though, if the US actually "get accustomed" to 240V for general household circuits power companies are likely to eventually start using 240V phase to neutral transformers as they replace old 120/240V ones. Just a scientific guess though.
IMO the whole "Is Schuko good or not?"-discussion is missing one important point - as someone called it in German "die normative Kraft des Faktischen", I guess that translates to "the standardizing force of facts". They are simply everywhere, and replacing them would cause incredible trouble. Heck, not even the transition from ungrounded 2 pin plugs to Schuko/Euro/Contour plugs worked properly! There are still hundreds of thousands of old plugs in use, either in old sockets of filed/broken down to fit Schuko sockets, even though they were banned more than 30 years ago!
Not only electricity takes the path of the least resistance
