Because who doesn't enjoy downloading a game, then waiting for it to download without reliable background downloading support? (toucharcade.com)
This included long gaming sessions, watching video, talking for an hour, and lots of background downloading from email and social networking apps. (digitaltrends.com)
Wi - Fi Assist can only be employed by apps you're actually using in the foreground, and doesn't activate with background downloading of content. (iphonehacks.com)