I disagree. I often find myself in runs with people who tunnel the bosses. Even in VoG, I will find myself picking off supplicants during time's vengeance so we don't get 4 corpses as people bail from the central block. Encounters in this game are very add heavy. With the exception of the fallen walker, the adds present infinitely greater threat to your team than the boss, despite the boss needing to be down to end the encounter. People who choose to be team players rather than tunnel a boss, thus making an encounter successful, should not have that count against them as yet another stat for people to "armory troll". Signed, someone who keeps peeling 4 stealth vandals off "ye boss-happy rocketeer" in the archon priest fight.