If you've ever wondered, wondered whatever became of me
The funny thing is, there's a semi-natural inclination to walk through the "doorway" (even though there's no door there) rather than walk through the spaces in the stud wall. These spaces will admit just about any size human being, so it's not about efficiency. It's just about some things are "walls" and some things are "doors". (Even though, right now, they're just outlines.)
It's very Les Nessman.