The major difference is that almost no one buys a playstation and xbox for their built in capabilities - the games are the major reason people want these devices. Yes, people stream netflix on them, but usually because it is convenient with their AV install, not because it is some major differentiator that other devices don't have. Whereas with smart phones, it is reasonable and common to never touch the app store. Or at least never touch non-free apps from the app store.