Those things are fart boxes, and they get unusable by lunch time.

Anyplace I've been with private offices pretty much had an open-door policy. If you weren't doing something that required privacy, you kept the door open or at some point someone would almost certainly comment.

I don't envy the prospect of talking to a future employer when you work in a public space. Every day, you frequently respond, "uhhh no thanks" or, "maybe... Hold on I'll call you back" while you step outside the room suspiciously.