I think he was advocating optional app stores, not a sole-provider app store like on iOS. Even though OS X and Android have app stores, they also let you instal

I think he was advocating optional app stores, not a sole-provider app store like on iOS. Even though OS X and Android have app stores, they also let you install any “unapproved” apps you want and open whatever web apps you want, after changing a one-time setting. The proposed Windows 8.2 would probably be the same. As long as app stores remain optional, I think they are a good thing. It is a lot simpler for users to browse one place for apps and install all apps in the same simple way. An app store is a reassuringly simple way to install software for those who aren’t very confident with modifying their computers.