The rules already seem to support rolling once for damage on an aoe spell (although this might be a speed suggestion for the preview adventure rather than anything that will be in the PHB) so if you did that and you rolled once for the attack you could really change the math of the encounter by consuming a daily resource to no effect (two bad rolls) or to amazing effect (two good rolls).
So yeah, unless it is a situation where I have 20 NPCs to keep track of in the fight I will require a roll for each target. In my preview game experience it has taken less time to roll the dice than it has taken the wizards player to decide where the optimal target location is.
So yeah, unless it is a situation where I have 20 NPCs to keep track of in the fight I will require a roll for each target. In my preview game experience it has taken less time to roll the dice than it has taken the wizards player to decide where the optimal target location is.
