I don't think you're getting the difference between a point attack, and an AOE affect. They are not the same. I.e, it's feasible to avoid a sword strike pretty easy in the mind's eye. It's not really feasible to avoid an entire area that gets blasted (outside of some magical assistance). If you're in the AoE, something will most likely happen. Therefore, something like a fireball and a sword are two completely different things. And the "dodged the blade but still took partial damage" is what happens when the attacker hits, but rolls low on the damage dice. If it misses, it misses. AoE don't have to hit directly like a sword does to do damage. It's the whole point of being AoE