I think it's more, 3-phase+N can be converted to 1-phase whenever needed with simple wiring. So even in France, you might have 3+N coming to the breaker panel,

I think it's more, 3-phase+N can be converted to 1-phase whenever needed with simple wiring. So even in France, you might have 3+N coming to the breaker panel, and then 1-phase from there on.