It's not 'slighting' the art - perhaps I don't make it explicit, but the fact that the art style is not perfectly polished clean, smooth lines gives it a kind of a 'Golden Age of Animation' vibe. The roughness is stylistic in origin, not amateurish, and I rather feel that it adds a kind of texture to the art that is very hard to pull off in a 2D medium. Upon re-reading Veil, I can't imagine it being portrayed with the kind of unforgiving line control one might find in, say, Gunsmith Cats or Cannon God Exaxxion.
