An unswitched live at the ceiling is sometimes seen in Germany, but it is not because of loop-through wiring, but in case folk want a fan or a heater as well as a light.

Also sometimes 2 different switched lives, so that you can have all or half lights on  in a complex fitting.

Neither are as common as just finding a just switched live neutral and earth on their own.

Pretty much all wiring is loop through switch, mainly as the domestic standard is to have combined lights and power circuits, and you will often see a wall socket and a light switch together by the door, sharing a common 16A feed.  Clearly in such a case you have L+N and E at the socket, so it all continues on as L+ N& E to the light fitting.

2 & 3 way lighting can quickly become  confusing, and you will often find 2 core plus earth running between the switches, rather than 3+ E as we would.

So called 'Hamburger' switching exists but is not permitted by current German regs - in this case the lamp is between the sliders of 2 switches, each switched to either L or N (so the lamp is off with either N-N or -L, and on with L-N and N-L. As either side of the lamp could be live it is not considered safe, and should be removed if found.)

An unswitched live at the ceiling is sometimes seen in Germany, but it is not because of loop-through wiring, but in case folk want a fan or a heater as well as a light.

Also sometimes 2 different switched lives, so that you can have all or half lights on  in a complex fitting.

Neither are as common as just finding a just switched live neutral and earth on their own.

Pretty much all wiring is loop through switch, mainly as the domestic standard is to have combined lights and power circuits, and you will often see a wall socket and a light switch together by the door, sharing a common 16A feed.  Clearly in such a case you have L+N and E at the socket, so it all continues on as L+ N& E to the light fitting.

2 & 3 way lighting can quickly become  confusing, and you will often find 2 core plus earth running between the switches, rather than 3+ E as we would.

So called 'Hamburger' switching exists but is not permitted by current German regs - in this case the lamp is between the sliders of 2 switches, each switched to either L or N (so the lamp is off with either N-N or -L, and on with L-N and N-L. As either side of the lamp could be live it is not considered safe, and should be removed if found.)