Batman is a moron, the game was not "finished" when it launched in September. There are still a myriad of bugs in the version today.
They obviously did not have enough time to playtest the game, especially the raids, as is evident from the huge glitches and cheeses that existed when they were finally released.
So how can you say that content was "finished".
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I don't think it was a question of time, just a question of monies. It cost money to bring in play testers and bungie don't want to spend a dime.