It won't be like this in the final release. Is it not clear that the beta is not a finished game? It seems obvious to me. An idea I had is that they could release a weekly patch or something to give us a new quest line to look forward to. That way every experience is truly new. There wouldn't be repeated or reused quests. It would also make sense for why it's not in the beta because they're likely saving these quests for the final release.