Sometimes, I think architects deliberately try to muddy the waters! Look at these other examples:

1) "Open" kitchens and combined counters / bars make the boundary between the kitchen and the rest of the house indefinite;

2) The addition of hot tubs, and "open" baths, to bedrooms makes the distinction of these two rooms open to debate;

3) As in this example, combined massive closets with 'dressing room' features start another debate; and,

4) The current "Casita" and courtyard design even opens a debate as to 'separate residences.'

I'm sure there are other examples. Perhaps we ought to remember them, as well as other judgment calls we must make, the next time someone asserts that the electrician is simply a body with a toolbelt!