Because the game could be bigger on PC but a lot smaller on consoles due to limitations thus putting console players at a disadvantage. They probably want the game to be the same across all platforms so nobody feels cheated.
That's what I think anyway.
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PC gamers would feel cheated if they didnt get it not because it wasnt a huge PCcentric game
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"They probably want the game to be the same across all platforms" -- its not even on PC and the console players at a disadvantage??? they are the ones who keep bragging consoles are equal to PC's.