I like to make things simple

Wipe because boss keep hitting Other beside tank? Obviously tank fault
Wipe because dps keep getting hit from avoidable red circle? Dps fault
Wipe because party hp bar keep getting depleted? Healer fault

Boss at the vault is mostly dps (and healer) problems, a lot of their attack is multi target/aoe so it doesnt matter if tank doing back to wall style, dps will still getting hit left and right, the boss fight at the vault is mostly about how good you are at dodging stuff