I agree it gets dropped where it can deal the most damage at the least cost. The thing I am arguing about here is that least cost generally means NOT fragging your allies. Unless the Wizard wins initiative AND the enemies are grouped together that will mean only a few enemies are going to get hit.People don't actually play the way you are suggesting. Fireball gets dropped where it can deal the most damage at the least cost unless there is a good reason for it to include allies. The combat you are suggesting is a speedbump that does not create a good reason that justifies including the rogue just for giggles. That remains true until you start including things like "well what if the veterans are focused on an actually squishy pc who needs to be rescued asap or die & that requires including the rogue because we both know he's going to just cunning action disengage"
In the LMOP example - 2 bad guys on both sides of the road, a wagon with horses and civilians in the middle - that will be 2 bad guys you get, not all 4 and certainly not the 33 or whatever number was being thrown around above. You could get the same 2 guys with lightning bolt if you moved to line them up. For the same slot you could als have got 2 bad guys with fear, hypnotic pattern or upcast hold person, you could have got 3 of them with upcast Cause Fear on a 3rd level slot.
Cunning action disengage does not keep him from getting attacked in melee. It keeps him from taking AOOs that is all. He has to dash if he does not want to get attacked in melee the following round and if you have played a Rogue (or a Goblin) in 5E you should know that and cunning action disengage does nothing at all on someone else's turn.
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