The sour fact is that without Air Glaive she's literally helpless in matchups where the opponent has better normals, which is like, everyone?
So what if you're +3 for 1 bar on a high, all you get is a b343 blockstring or a throw.
Vault's run is useless against anyone who either has a fullscreen punish for glow such as Scorpion or a zoning tool that ignores your amazing 56f zoning immunity (lol) because they'll just blow you up for using it. Which is again most of the cast.
At least MB Air Glaive is + on block and instant air glaive stops idiots from mashing d1