On Yahoo!'s work from home ban

What Marissa Mayer's ban on working from home says to me is that for better or worse Yahoo! is at least moving. Some believe it's going to backfire badly. Can anyone really argue that change at Yahoo! isn't absolutely necessary?

Max Levchin's thoughts on working from home: in many cases "working from home" is not really working. (Via Quora, behind a walled garden.)