Even if there are quests with different angles, such as scenario A1, scenario A2, scenario A3, they will be no different from scenario A1. It’s possible to flesh out some ideas, fix the axis of time and create "A1", "A2", and "A3" as parallel episodes. However, in this case, after clearing episode A, once you play episode B, you're already heading towards the future of the scenario and if you then play episode A2 or A3, narrative paradoxes will develop.
So, you're thinking now, "Well, how about if you create a episode A2 version 2 in case you play episode A2 after clearing episode B…" This is just not possible. For a console game, there is a finite end point so something like this is possible. You can even play again from the beginning. But for an MMO, as long as it is being updated, the "what ifs" can continue on infinitely.