Well, the argument with Diablo 3 was that the game had an in-game auction house on launch, where you could sell in-game items for real money. So the game had to be fully online to make sure items are only generated when really earned. Of course the auction house disappeared and the requirement to always be online didn't(having said that, the console versions of diablo 3 don't require being online - but from what I understand significant portion of the game was rewritten to allow the game to work online, on consoles, and with a gamepad)
I appreciate this typo on a spiritual level.