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Random anecdote: I once got stuck at a friends place in Denmark with my Tesla, because the mobile connector wouldn't work. Turns out despite the voltage and socket being the same, the grounding can vary between countries and the connector wouldn't let me charge (this was back in 2016, I'm not sure if newer mobile connectors are better in that regard)

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Is that because some places have 230V and neutral, while others have -115V and +115V (yes like in the US but in Europe)?

There's a single neighborhood in Rome where that happens and car chargers don't work. The "solution" is to request a three-phase 400V connection: the utility company can't deny it and it must be 220V to neutral.

I would like to live in the alternative reality were all AC is three-phase AC; probably it would be uselessly more expensive for normal domestic stuff but it would be quite cooler.

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