The Quest is fully designed for new players.
The Red War Campaign was vaulted, so new players are introduced to Destiny with this Quest.
Bungie just gave Veterans the option to play it too.
English
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Ah alright, I was just scared of my storyline being overwritten. I get that makes no sense now, but why would they do it? Why publish the Game and the Expansions just to skip it and make the base game free to play. they never did that in D1...
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A lot of the base content was vaulted to make space for newer content, and (presumably) to work on it in the background.