Probably for the same reason that they changes dailies to be easier: because they want them to be accessible to casual players (that is, something you can log on once a day and achieve in a couple of games, not a couple of hours).
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Probably for the same reason that they changes dailies to be easier: because they want them to be accessible to casual players (that is, something you can log on once a day and achieve in a couple of games, not a couple of hours).