Its a bit of a picky topic about releasing a game with bugs and shit.
Sure you can set a date for release, and decide your gonna get it out there on that date regardless of how you are going. If you do have some bugs and fixes that needs to be done that's fail on time management but its not too much of an issue, that's what patches are for.
But the point I was trying to make is that you can either release a game on a set date and make the players happy that its out, and sad that its buggy, or you can do a good 'ol blizzard trick and keep knocking the game release back and have unhappy people because of the wait, but have a good game play because of the no errors.
Its really just an issue about time management and other bumps along the way
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