From the article: "One of the best parts about the fully cloudy/Chrome OS requirement is this means that from the user perspective everything is always in sync.

From the article: "One of the best parts about the fully cloudy/Chrome OS requirement is this means that from the user perspective everything is always in sync. I log off the computer at home, come to work, log on and its like I’m on the same computer." So using a single computer wouldn't provide that, unless you took it with you which the author would apparently prefer not to do.