Why did bungie leave behind the year 1 strikes? That doesn't make any sense whatsoever? It is like they are trying to make the game less fun! The only reason I can think of to why they would remove these strikes from year 2 is so we would play the year 2 strikes more, and that is absolutely stupid.
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It would have made sense if they did it just for the first month, to highlight the new strikes. But now I think it's simply laziness. I'm not sure how much effort has to go in modifying the strikes to include the Taken, but Bungie clearly deemed it too much.