With 4 ranged classes you of course wont die that often (unless you are being overrun and all die). But what do you do when it happens that only 1 or 2 of your character dies? Eg I could play quite good with tank and the dd parked a little bit behind, especially because of the guard buff. But if only one dies things get complicated: to fight on one screen and to run back to the fight on the other screen.