Bullets don't solve everything. I've used AWR all my time(still am). Our greatest weakness is running out of ammo. Out of ammo and your DONE. That means you have to invest everything into ammo. No targetings no dexterity and you want all in on reserves if to want the most out of Xeno. Oh and scavengers. We don't get to have good grenades, or slippery speedy tactics. No bullets=no light. No speed will save me, only way to go then is Ward of Dawn. Now you lose the freedom of your supers. If bullets are all you need then good, go get um, but I have seen many try to use the build I am using and trust me, they need more than just bullets.
Bro I’m just talking about an exotic for boss damage... If you can always use your full ammo off of the rally banner in one damage phase that’s great. Even if you don’t find another heavy brick for a long time you’re beating the rest of the team on damage if your aim is good.