Oh, you are right,with burstin shot our AOE will be really incredible.
Spoiler:
Do you know that's Bursting Shot deals (6.76% of Attack power) Physical damage?
It's nothing, and Multishot (26.52% of AP), Barrage (18.2% of AP) are also nothing.
Explosive shot (131.04% of of AP) is clunky as hell, and you will never use this spell.
In the end, our primary damage is dealt by AS. Which do around zero damage on targets < 5.