Winning in Silicon Valley is about technology, but it is about culture as well. Mayer's first job at Yahoo is to build culture, and she needs her deputies in the office.
Three cheers for Marissa. She understands that business is civilized warfare. Being a loser in war is not pleasant. Your village gets pillaged. Your citizens become dispirited. Your population is abused and worse. When you lose in business, employees lose their motivation. Turnover skyrockets. Sales dwindle away. Every budget meeting is about death by 1000 cuts. Ultimately, the war ends, and the village is destroyed.
Winning in Silicon Valley is about technology but it is about culture as well -- determination, discipline, teamwork, commitment, belief that you can overcome adversity. Working remotely works extremely well if it is well thought our and embedded in a winning culture. In Yahoo's case, the winning culture is not there. Mayer will have to build it. When she finishes that job, WAHs (Work At Home employees) will be among her most effective, creative, and productive members of her team.
Mayer's communication with employees has been chewed over in the press and in blogs. The one criticism I would make is it focused too much on better decisions, insights, creativity, cafeteria discussions, speed, and quality and not enough on creating a winning corporate culture. When the culture is right, other things fall into place.