Pantheon's Aegis Assualt, why does it block AoE damage?

So, if im right, Pantheon's shield blocks damage coming from a certain direction. However I noticed he can even block a Veigar W if he's looking at Veigar. I can't say if he is op or underpowered, but I do not think he should be able to negate damage that is based on a large area. (Though if he gained resistance to aoe damage that would be okay.) Does anyone think it should depend on the direction damage is coming from similar to Bruam? So projectiles, auto attacks, deal no damage, while AoE deals reduced or full damage?
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