You can't "sit in the back and snipe" in any of those fights. At some point you will have to take cover, move, kill enemies, etc. Archon priest, you are talking about sniping from top of the cliff? That's a glitch. Invalid argument. Phogoth, where? You will get hit. You won't have 100% cover. Tell me which place this is you are talking about. Sepiks prime is easy but again, you don't do it by sniping in the back and you don't need a BH. It's the first strike; it will be easy regardless. As you can see, there is no boss encounter that let you snipe safely without doing anything else. And yeah. this is a big change for BH. Not worrying about running out of ammo when you are being accurate is really special. You take that away and the weapon is no longer special.