This is because Diablo 4 doesn't keep track of the side quests players have already completed. So when players get to the point where they have, say, just a few side quests left to complete in a specific region, they have no clue how to find them. They can't compare a list of side quests to the ones they've already completed because the game doesn't keep track, so it becomes guesswork. A simple solution for this would be for Blizzard to add a log of completed side quests, but no plans to that effect have been announced at the time of this writing.
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