I'd like to offer a different perspective to DoAM with area effect saves....
And every single spell that includes damage for a successful saving throw is, definitionally, also damage on a miss. You missed them with that fireball, but they still took damage from it.
...
Firreball hits the area (doesn't "miss"). Some targets caught off guard or in the open (failed save), takes full damage. Other targets duck low, take shelter behind table, or just get lucky as the fiery blaze swirls around and manage to take less damage.
No "miss" involved.

