You just stated the problem, which is that its a cheap way to add in play time without adding in real content
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The content is part of the problem. They have already issued exotic items which are the best items in the game. However the dlc promices new and better exotics. So they have to find a solution to make the new exotics better like they said but keep every exotic, exotic by having the max light and power, they did the reset to acomplish this, that way the new exotics are favored and more desired and easier to level up, wile at the same time allowing old exotics to stay at the top with alittle extra work.