I'll seize the opportunity to ask what the Swiss wiring looks like today: If I've understood things correctly homes in Switzerland usually have 3-phase. Correct?

How about the sockets outlets: The Swiss sockets are only used in Switzerland: Used to be 10A. Has this changed? What are types 12, 13 and 23?

Denmark and Italy which also have their own socket outlets have been flooded with German plugs. Is this the case in Switzerland too?