Besides wings, then, what would be the point? And I bring up wings mainly because harpy wings kind of fill that slot already, but admittedly they still are not Angel wings specifically. Corruption Tolerance would render any need for a corruption gains nerf rather mute. Since racial stat cap buffs are out, that's a no go. Scene and description rewrites to describe an actual Angel type instead of just a human with harpy wings would need writers. Not saying I'm against the idea, just not sure what it's merit would be to go through the trouble. I don't know, maybe if you hit ascension without any corruption or non-human TF's you get a halo and some unique perk/achievement for your troubles. Maybe you're immune to lust-based attacks, though that would be stupid OP in some situations.
Besides, and maybe I'm a weirdo for this, but with the way CoC plays out lore-wise in my head, the presence and existence of demons doesn't really confirm or reinforce the notion that angels would also exist in the same realm. In my mind, pure uncorrupted humans better take up the mantle of being the opposite end of that spectrum.