Dunno, I think another way to look at it is that the events in the Vanguard
finale are of such in-universe historic importance that yes, looking at them from another angle may strike one as redundant, but on the other hand it's exactly the kind of thing that you want multiple angles of in the big picture. Just like important real world historic events are best understood via an intersection of multiple voices ... or if you don't
want to go that deep, well, it's pretty optional. I just feel that it underscores the importance of the saga to give that option.