It has. Everywhere I worked, what the book describes as american is pretty much the standard in Germany, too.
Though I've often closed my door simply to shut out the noise when I needed to get serious thinking work done.
I don't know about Germany, but in Australia the culture of the 90's was radically different to our culture now. Something from 1966 is likely to be nothing more then a interesting historic read, and even then we must examine the bias.
What's the point of closing the door if it doesn't cut sound?
Globalization means everyone probably has the same door standards now...
