Well having Mythcarver fall into enemy claws, and being the MacGuffin of MacGuffin-finding, was a major narrative improvement, given that it's the vestige which, in the stream, became mostly irrelevant because Scanlan's player was just not really interested in using a sword.
I don't particularly remember what all the vestiges were, because of course each player got one, but the Bow and the Gauntlets are the (remaining) ones where I actually remember the plot arcs involved in questing after them, so it seems like a good choice to highlight those, if they are paring down the MacGuffin list.
They seem to have already folded the abilities of Whisper the teleporting dagger into Vax's other, far more story-important vestige, which makes a lot of story sense.