[pluma]

Situation in Germany is pretty similar. I've never seen a bayonet mount in my life, I think. Also our flats don't come with lightbulbs either.

Every German who has moved flats a couple of times thus owns a few barebone lamp socket assemblies which are affectionately called "Russian chandeliers" (with apologies to Russians). When moving in these are usually the first things to go up until proper lamps are installed.

EDIT: I think I've seen bayonet mounts in some antique furniture at my grand parents' house as a child. But it certainly strikes me as a bit of an anachronism, much like American farmhouse style windows (the kind you slide up) compared to tilt turn windows (which are the norm in my country).