I think the point with the launderette is not so much that most residents of certain countries have their own laundry machines at home or in their apartment buildings. It's more that (here in the US anyway), one wouldn't think of finding a laundry facility or bringing one's soiled clothes to an enclosed shopping mall. Laundromats tend to be free-standing structures or at least face the outside when connected to other buildings. Another example would be full-sized supermarkets; they do exist within shopping malls in urban areas here in the US sometimes given limited space considerations, but that's pretty unusual for us and more typically we would see them off to the side or next door to such a structure.