You are making up assumptions that are not part of the game.
@Aldarc and I already quoted the rules text upthread, from the 4e PHB, that tells us what a
miss means. It doesn't mean what you say here.
And there is no assumption, in the game, that a fireball is literally affecting the entirety of a character's space such they they can't avoid it. In fact the game presents, and treats, both the weapon attack and the elemental AoE as identical except that the AoE can affect more targets.
When the game is played in accordance with its rule, it does not present contradictions or incoherence. What it does present, as I already posted just upthread, is a world in which heroes, even those who are severely set back by the physical or mental attacks of their opponents, are able to press on and recover from that setback provided they have sufficient inner resolve and the support of their allies.
This fiction may be too sentimental for some tastes, but it is not incoherent.