Zalmarat targeting and immunity is Broken!

Why are we forced to fight a boss whose hit box is his hands? Does this not make sense to anyone else? His mechanics revolve around his hands and they are UNHITABLE when he is using a mechanic which is over 1/2 the encounter. if me, as lets say a ranger tries to use electrocuting arrow (have to flip over the target) how did you see that working? Why are his hands not targetable while he is casting an ability? i use over 1/2 my mana fighting him and even though the boss takes up over 1/2 my screen i CAN NOT LAND A SHOT! These mechanics feel incredibly lazy and incomplete. First clue to the current state of brokenness is that every ranged class in the game has to hug the boss to hopefully do damage and land shots. His ranged mechanics are so fast and given you can not hit him while these are in effect and are just shooting arrows into the air really is a joke. there is no way to tell if your even aiming in the right direction. Most of the time my chr is forced to aim completely opposite of where the boss is because im locked on his hand. I expected better with all the self back patting prior to release.