Any significant game needs a box.
Reason number one - how does one collect collector's item from GoG or Steam?
Reason number two - the nearest game shop is a five minutes walk from the office.
Reason number three - when a game ain't not no real good,
like Watch Dog's for PC, it is so much fun tossing the box and its content, maybe even smashing it a bit first, into the trash can. With Steam, all one can do is delete some mysterious bites, no fun what so ever.